CS22220 Datasheet, PDF (15/34 Pages) Cirrus Logic – WIRELESS PCI/USB CONTROLLER

PC Card Interface
The PC Card interface is PCMCIA 2.1 fully compliant interface. The following provides detail pin
description.
PCD[15:0]
PCA[10:0]
nPCE[2:1]
Bi-directional
Data lines. The data bus contains the data to be written on a write cycle
and the read return data on a read cycle.
Input
Address lines. Signal PCA[10:0] are address bus input lines. PCA10 is
the most significant bit. During memory word access mode, A0 is not
used. During I/O word access cycle, A0 must be negated.
Input
Card enable. These lines are active low input signals. nPCE1 enables
even numbered addresses and nPCE2 enables odd numbered
addresses.
nPOE
nPCWE
nPCREG
nPCIREQ
nPCSTSCHG
Input
Output enable. This signal is used to gate memory read data from
memory card.
Input
Write enable. This is active low input signal is used for strobing memory
write data into the memory card.
Input
Attribute memory select. Assertion of this signal indicates the access is
limited to attribute memory and to I/O space. Attribute memory is a
separate accessed section of card memory and is generally used to
record card capacity and other configuration and attribute information.
Output
Interrupt request. This signal is asserted to indicate to the host system
that a PC card device requires host software service.
Output
PC card status changed – Not supported. This pin is used as a mode
strap pin. When asserted during reset, PC CARD I/F uses the big endian
protocol; otherwise pulled low (Default), it uses the little endian protocol.
CS22220 Wireless PCMCIA Controller
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DS557PP2 Rev. 3.0