Z86017 Datasheet, PDF (91/138 Pages) Zilog, Inc. – PCMCIA Interface Solution

Z86017/Z16017 PCMCIA Interface Solution
Product Specification
77
PCMCIA Host Writes
PCMCIA Host Reads
PC_DATA<15-8>
PC_DATA<7-0>
Data
MUX
PC_DATA<15-8>
ATA_DATA<7-0>
PC_DATA<7-0>
Data
Reciever
Data
Latch
ATA_DATA<7-0>
Figure 11. Word-to-Byte Mode Data Path
• PCMCIA Host Write
PC_DATA<7–0> (Even Byte) written to ATA_DATA<7–0>
PC_DATA<15–8> (Odd Byte) written to ATA_DATA<7–0>
• PCMCIA Host Read
The PCMCIA selects an even address, then the ZX6017 pulls WAIT
and reads the even register from the peripheral device, saves it in a
latch, increments the local peripherals address bus, then reads the odd
data byte and clears the PCMCIA WAIT pin.
ATA_DATA<7–0> (Even Byte) put onto PC_DATA<7–0>
ATA_DATA<7–0> (Odd Byte) put onto PC_DATA<15–8>
Table 60 describes the PCMCIA Host read and write address examples.
Programming Internal Registers
PS012002-1201