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Part: PCI950PT
Category:
Interface and Interconnect
-> PCI
-> CardBus Controllers
Description: ti PCI950, Serial Interrupt Stream Deserializer
Company: Texas Instruments, Inc.
Datasheet: Download PCI950PT datasheet File size : 3358 kB
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Datasheet text preview:
PCI950 IRQSER DESERIALIZER
SCPS015A JULY 1997 REVISED JANUARY 1998
D 5-V Core Logic With PCI Interface D Supports PCI Clock Frequencies up to D D D
33 MHz Accepts IRQSER Serial Interrupt Stream Input From TI PC Card Controllers Provides System Access to All 15 ISA-Style IRQs and 4 PCI-Style Interrupts Offered in 48-Pin TQFP Package
IRQ15 IRQ3 VCC GND IRQ14 IRQ13 NC IRQ8 NC VCC IRQ12 IRQ11
36 35 34 33 32 31 30 29 28 27 26 25 37 24 38 23 39 22 40 21 41 20 42 19 43 18 44 17 45 16 46 15 47 14 48 13 1 2 3 4 5 6 7 8 9 10 11 12
RSTIN SHUTD CLKRUN VCC POLLMODE NC GND STOP PCLK GND NC ACTIVE
IRQSER IRQ0 IRQ1 IRQ2/SMI VCC NC INTD INTC INTB INTA GND DRIVEMODE
description
The PCI950 is an IRQSER interrupt deserializer that interfaces with existing and future TI PC Card controllers. The PCI950 accepts the IRQSER output of a TI PC Card controller and converts it to 16 ISA-style interrupts and 4 PCI-style interrupts. Interfacing the PC Card controller with the PCI950 permits system access of all available interrupts and features of the PC Card controller.
functional block diagram
PCLK RSTIN CLKRUN IRQSER POLLMODE SHUTD STOP DRIVEMODE PCI950
16 4
IRQ150 INTAD ACTIVE
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
TI is a trademark of Texas Instruments Incorporated.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
IRQ10 IRQ9 IRQ7 IRQ6 GND VCC NC NC IRQ5 NC NC IRQ4
Copyright 1998, Texas Instruments Incorporated
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PCI950 IRQSER DESERIALIZER
SCPS015A JULY 1997 REVISED JANUARY 1998
Terminal Functions
TERMINAL NAME ACTIVE NO. 25 I/O TYPE O FUNCTION Device active. When the PCI950 is busy, this output is low and when the PCI950 is idle, this output is high. PCI clock run. CLKRUN is used by the central resource to request permission to stop the PCI clock or to slow the PCI clock rate. When the PCI950 is busy and CLKRUN is sampled high, then CLKRUN is driven low for two clock cycles. If CLKRUN is not used, it can be tied low. See Note 1. Drive mode. When this input is high and the PCI950 samples a low on the IRQSER line during the sample phase of the IRQ data frame, then the PCI950 drives the IRQSER line high during the recovery phase. When this input is low and the PCI950 samples a low level on the IRQSER line during the sample phase of the IRQ data frame, then the PCI950 three-states the IRQSER line during the recovery phase. Device ground terminals PCI-style interrupts. These are four parallel PCI-style Interrupts, INTAINTD. The PCI950 provides the PCI interrupts in an open-drain environment, which requires the system vendor to implement a pullup resistor on each implemented interrupt.
CLKRUN
34
I/O
DRIVEMODE
13
I
GND INTA, INTB, INTC, INTD
5, 14, 27, 30, 40 15, 16, 17, 18 23, 22, 38,12, 9, 4, 3, 44, 2, 1, 48, 47, 42, 41, 37 21 24 7, 8, 10, 11, 19, 26, 31, 43, 45 28
--
O
IRQ0, IRQ1, IRQ315
O
ISA-style interrupts. These are 15 parallel ISA interrupts, IRQ0, 1, 315. The PCI950 provides the ISA interrupts in an open-drain environment, which requires the system vendor to implement a pullup resistor on each implemented interrupt.
IRQ2/SMI IRQSER
O I/O
System management interrupt. The PCI950 provides the SMI interrupt in an open-drain environment, which requires the system vendor to implement a pullup resistor on each implemented interrupt. Serial interrupt stream from PC Card controller. This input is connected to the IRQSER output from the TI PC Card controller.
NC
--
No connection
PCLK
I
PCI-bus clock. The PCI-bus clock operates at frequencies ranging from 033 MHz. Poll mode. Selects between quiet mode and continuous mode. When this input is low, the PCI950 is in quiet mode. When this input is high, the PCI950 is in continuous mode. The POLLMODE signal is sampled during the rising edge of a start frame. After reset, the PCI950 generates the first cycle, and the stop-frame width in this cycle is set based on the POLLMODE input level. Any change in POLLMODE input causes the PCI950 to generate a start pulse. Device reset. When RSTIN is asserted low, the internal counters are reset and all output buffers are put in a high-impedance state (three stated). After RSTIN is deasserted, the PCI950 defaults to continuous mode. Shutdown. When SHUTD input is low, the internal clock is stopped and the outputs are placed in a high-impedance state (three stated). When SHUTD input is high, the device is in normal operation. During continuous mode of operation, the recommended use of SHUTD is to first assert STOP input, check that ACTIVE is high, and then assert SHUTD to stop the clock. During quiet mode of operation, the SHUTD input can be asserted after ACTIVE is sampled high. Stop continuous mode. The default number of idle clocks between stop and start frame in continuous mode is one. But the STOP pin can be used to insert more than one idle state. If the PCI950 is in continuous mode and if during an IRQSER cycle the STOP input is driven low, then after completion of the IRQSER cycle any number of idle states can be inserted. The next start frame is initiated by PCI950 when STOP is driven high. If STOP is not to be used, then it must be tied high. See Note 1. Device 5-V power-supply terminals
POLLMODE
32
I
RSTIN
36
I
SHUTD
35
I
STOP
29
I
VCC
6, 20, 33, 39, 46
--
NOTE 1: Unused active-low inputs must be pulled up to VCC using a 43 kW resistor, and unused active-high inputs must be pulled down to GND using a 43 kW resistor.
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
PCI950 IRQSER DESERIALIZER
SCPS015A JULY 1997 REVISED JANUARY 1998
functional description
The PCI950 accepts the serialized IRQ stream from the PC Card controller for conversion to discrete ISA and PCI interrupts. The serialized IRQ protocol is defined in the document Serialized IRQ Protocol for PCI Systems, revision 6.0. This protocol uses a serial packet consisting of one start frame, several IRQ/data frames, and one stop frame. Start frame: There are two modes of operation for the IRQSER start frame quiet mode and continuous mode. During continuous mode the PCI950 initiates the start frame. A low level on the POLLMODE input pin selects the quiet mode and a high level selects continuous mode for the PCI950. The total low-pulse width on a start frame is eight clocks. After reset the PCI950 defaults to continuous mode. IRQ/data frame: The PCI950 is designed to decode a fixed length of 21 IRQ/data frames that are sampled in the following sequence: IRQ0, IRQ1, SMI, IRQ3 through IRQ15, IOCHK, INTA, INTB, INTC, and INTD. Stop frame: After the completion of a start frame and 21 IRQ data frames, the PCI950 generates a stop frame. The pulse width of the stop pulse is determined by the status of the POLLMODE input pin sampled during the start frame.
Start Frame (see Notes 2 and 3) RT PCLK IRQ0 S RT IRQ1 S R T IRQ2 S R T IRQ3 S R T S IRQ4 R T
IRQSER DRIVE 2 PCI950 Legend: R = Recovery S = Sample T = Turnaround None IRQ3 None
NOTES: 2. Start frame is eight clocks in duration. 3. Slave or host initiated: POLLMODE is level dependent.
Figure 1. IRQSER Start-Frame Timing
IRQ15 S PCLK RT IOCHK S R T INTA S R T INTB S R T S INTC R T S INTD R T Stop Frame I (see Notes 4 and 5) (see Note 6) I R T
IRQSER DRIVE IRQ15 Legend: R = Recovery S = Sample T = Turnaround I = Idle NOTES: 4. The PCI950 stop pulse is two or three clocks in duration. 5. There may be none, one, or more idle states during the stop frame. 6. When the PCI950 is in continuous mode, there are 17 idle states between the stop frame and the start frame. None PCI950
Figure 2. IRQSER Stop-Frame Timing
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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