OXmPCI952
OXFORD SEMICONDUCTOR LTD.
8-bit local bus
Mode 0
Dir1
Name
Description
71
O
UART_Clk_Out Buffered crystal output. This clock can drive external UARTs
connected to the local bus. Can be enabled / disabled by
software.
123
124
102
O(h) LBRST
Local bus active-high reset
Local bus active-low reset
Local bus data out enable. This pin can be used by external
transceivers; it is high when LBD[7:0] are in output mode and
low when they are in input mode.
O
O
LBRST#
LBDOUT
108
O
LBCLK
Buffered PCI clock. Can be enabled / disabled by software
Local bus active-low Chip-Select (Intel mode)
113, 114, 115, 116
O(h) LBCS[3:0]#
O(h) LBDS[3:0]#
Local bus active-low Data-Strobe (Motorola mode)
Local Bus active-low write-strobe (Intel mode)
111
112
O
LBWR#
O
O
LBRDWR#
LBRD#
Local Bus Read-not-Write control (Motorola mode)
Local Bus active-low read-strobe (Intel mode)
Z
Hi-Z
Permanent high impedance (Motorola mode)
Local bus address signals
104, 105, 106, 107
119, 120, 121, 122
92, 93, 94, 95
O(h) LBA[7:0]
I/O(h) LBD[7:0]
Local bus data signals
98, 99, 100, 101
Parallel port
Mode 1
123
Dir1
I(h)
Name
Description
ACK#
Acknowledge (SPP mode). ACK# is asserted (low) by the
peripheral to indicate that a successful data transfer has
taken place.
I(h)
I(h)
I(h)
INTR#
PE
BUSY
Identical function to ACK# (EPP mode).
122
121
Paper Empty. Activated by printer when it runs out of paper.
Busy (SPP mode). BUSY is asserted (high) by the peripheral
when it is not ready to accept data
I(h)
WAIT#
Wait (EPP mode). Handshake signal for interlocked IEEE
1284 compliant EPP cycles.
107
OD(h) SLIN#
Select (SPP mode). Asserted by host to select the peripheral
O(h) ADDRSTB#
Address strobe (EPP mode) provides address read and write
strobe
120
119
106
I(h)
I(h)
SLCT
ERR#
Peripheral selected. Asserted by peripheral when selected.
Error. Held low by the peripheral during an error condition.
Initialise (SPP mode). Commands the peripheral to initialise.
OD(h) INIT#
O(h) INIT#
OD(h) AFD#
Initialise (EPP mode). Identical function to SPP mode.
Auto Feed (SPP mode, open-drain)
105
O(h) DATASTB#
Data strobe (EPP mode) provides data read and write strobe
DS-0020 Jun 05
Page 12
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