Z86017 Datasheet, PDF (73/138 Pages) Zilog, Inc. – PCMCIA Interface Solution

Z86017/Z16017 PCMCIA Interface Solution
Product Specification
59
EEPROM Register
Address: SELECT 18h
Name: Window 3 Control Register
Type: Write/Read
Table 38. Window 3 Control Register: Address 18h
Bit Placement Bit Name
Description
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bits 7-6
DIS_PAC3
When set to 1, this bit disables Port 3 address control and
decoder.
EN_PAC3_MEM
When this bit is set to 1, Memory mode decoder is enabled.
When it is cleared, I/O mode decoder is enabled.
EN_PAC3_16+
When this bit is set, data swapping is provided internal to
the chip during data reads from the low byte of the ATA
bus to the PCMCIA bus high byte, and from the high byte
of the PCMCIA bus to the low byte of the ATA bus during
data writes. When this bit is cleared, it is high byte to high
byte and low byte to low byte.
READ_PROTECT
This bit allows two cards to be read from the same address.
When this bit is set, it prevents the PCMCIA bus from
becoming active.
EN_PAC3_ADDR_COMP When this bit is set, use address compare logic; when it is
cleared, acknowledge all PCMCIA chip selects.
EN_PAC3_HCS
When this bit is set, HCS1 is used as an external chip
select; when it is cleared, HCS0 is used as an external chip
select.
Number of wait states (in Master Clock periods) inserted
on the PCMCIA bus.
Programming Internal Registers
PS012002-1201