TI380PCI Datasheet, PDF (7/36 Pages) Texas Instruments – PCI BUS INTERFACE FOR THE TI380 COMMPROCESSORS

TI380PCI
PCI BUS INTERFACE FOR THE TI380 COMMPROCESSORS
Pin Functions – System Interface^† (Continued)
SPWS020 – AUGUST 1995
PIN
NAME
NO.
I/O‡
DESCRIPTION
System interrupt request. TI380C2x drives SIRQ to signal an interrupt request to the host processor.
SIRQ
6
I
H = No interrupt request
L = Interrupt request by TI380C2x
SAS
System memory address strobe. SAS is an active-low address strobe that is an output during DIO and
an input during DMA.§
2
I/O
H = Address not valid
L = Address is valid and a transfer operation is in progress
System read not write. SRNW serves as a control signal to indicate a read or write cycle.
SRNW
128
I / O _{H = Read Cycle}
L = Write Cycle
† _{The TI380PCI SIF pin names correspond to a subset of the system interface pins on a TI380C2x. Consult the TI380C2x data sheet for more}
information on individual pins. Like-named pins on the TI380PCI and TI380C2x system interfaces are intended to be connected to each other.
‡ _{I = in, O = out}
W ^§ The signal connecting this pin to the TI380C2x also should be connected to a 4.7-k pullup resistor.
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