ISA-to-PC-Card (PCMCIA) Controllers — PD6710/’22
Table 2. Socket Interface Pins (Sheet 2 of 4)
Pin Number
PD6722
Pin Name1
Description2
Qty.
I/O
Pwr. Drive
PD6710
Socket A
Socket B
Write Enable: For non-DMA transfers,
this signal goes active (low) to indicate
a memory write to the socket.
During a DMA read (when -IOWR is
active), this signal goes low if the ISA
output TC is active (high), indicating to
the card that the system’s terminal
count signal is active. During DMA
writes (when -IORD is active), this
output remains high.
-WE
37
37
99
1
O-TS 2 or 3 2 mA
I/O Read: This output is driven low for I/
O reads from the socket.
-IORD
-IOWR
28
30
26
29
90
92
1
1
O-TS 2 or 3 2 mA
O-TS 2 or 3 2 mA
I/O Write: This output is driven low for I/
O writes to the socket.
Write Protect / I/O Is 16-Bit: In
Memory Card Interface mode (Interrupt
and General Control register, bit 5 is
equal to ‘0’), this input is the status of
the PC card write protect switch.
WP/
-IOIS16 †
In I/O Card Interface mode, a low on
this input indicates that the I/O address
being accessed is capable of 16-bit
operation.
69
68
131
1
I-PU 2 or 3
–
In DMA mode, this pin can be
programmed as the -DREQ input from
a DMA-capable PC Card.
Input Acknowledge: This input
indicates to the PD67XX that the PC
Card supports I/O access at the current
address. A PC Card activates this input
during IORD cycles to which the card
can respond.
-INPACK †
57
56
119
1
I-PU 2 or 3
–
In DMA mode, this pin can be
programmed as the -DREQ input from
a DMA-capable PC Card.
Ready / Interrupt Request: In Memory
Card Interface mode, this input is
readable as the status of bit 5 of the
Interface Status register, which is
used by a PC Card to signal system
software of its ready or busy state.
RDY/
-IREQ †
39
55
39
54
101
116
1
1
I-PU 2 or 3
–
–
In I/O Card Interface mode, this active-
low input indicates an interrupt request.
Wait: This input indicates to the
PD67XX that the current card access
cycle is to be extended until this signal
becomes inactive (high).
-WAIT †
I-PU 2 or 3
1
1. To differentiate the sockets, all PD6722 pin names have either A_ or B_ prepended to the pin names indicated. For example,
A_A[25:0] and B_A[25:0] are the independent address buses to the sockets.
2. 2When a socket is configured as an ATA drive interface, socket interface pin functions change. See Table 17 on page 88.
Datasheet
21
INTEL [ INTEL ]
