PCA9504A 查看數據表（PDF） - Philips Electronics

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PCA9504A

8-bit I2C and SMBus I/O port with 2-kbit EEPROM

Philips Electronics 

Philips Semiconductors

Glue chip 4

Product data

PCA9504A

A20M*

GPO_FLUSH_CACHE*

INIT*

FLUSH_OUT_CPU*

FLUSH_OUT_FWH*

INIT_OUT*

A20M*

t1

t1

t1

tt

t

Figure 12. Waveforms for Case 7

SW00591

GPO_FLUSH_CACHE*

INIT*

t1

FLUSH_OUT_CPU*

FLUSH_OUT_FWH*

t1

tt

INIT_OUT*

Figure 13. Waveforms for boundary GPO_FLUSH_CACHE* Case

SW00592

• Timings should remain the same for both a 66 MHz or 33 MHz

CLK_IN input.

• The boundary condition for INIT listed above, is a special case

where immediately following the FLUSH_OUT*, INIT_OUT* cycle,

the ICH2 asserts INIT* into the Glue Chip.

• The boundary condition for GPO_FLUSH_CACHE* listed above,

is a special case where immediately following the first assertion of

GPO_FLUSH_CACHE*, the GPO is de-asserted, then re-asserted

again before the timings have had a chance to complete.

NOTE:

1. Nominal timing values with tolerances are listed in the DC

Characteristics table.

GPO_FLUSH_CACHE* – input to logic, GPO from the ICH2,

programmed active LOW.

INIT* – input to logic, INIT* signal from the ICH2.

A20M* – input to logic, A20M* signal from the ICH2.

FLUSH_OUT_CPU* – output of logic, route to CPU FLUSH* pin.

FLUSH_OUT_CPU* – output of logic, routed to FWH INIT* pin.

INIT_OUT* – output of logic, routed to CPU INIT* pin.

2004 May 11

21

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