cl-ps6700 Cirrus Logic, Inc., cl-ps6700 Datasheet - Page 14

• Manufacturer Part Number: cl-ps6700
• Description: Low-power Pc Card Controller For The Cl-ps7111
• Manufacturer: Cirrus Logic, Inc.

2.2 PC Card Interface Signals
A PC Card socket can be configured as either memory only or combined I/O-memory . Some pins on the
PC Card interface have different meanings in memory and I/O modes. These pins are listed as dual-mode.
The mode is selected by a configuration register bit. When I/O mode is programmed, the CPU accesses
either I/O space or memory space on the card according to the upper address bits. The CPU Attribute
memory is accessible in either memory or I/O modes, again, selected by the upper address bits. A card
DMA device is accessible only in I/O mode.
2.2.1 Address and Data Signals
Signal
2.2.2 Access Control Signals
Signal
PCM_CE_L[2:1]
PCM_OE_L
PCM_WE_L
14
PCM_D[15:0] I/O
PCM_A[25:0]
PIN DESCRIPTIONS
Type
O
Type
O
O
O
Source
Power
pcm
pcm
Source
Power
pcm
pcm
pcm
C
I R R U S
Description
PC Card data bus: Single-mode. Data transfer can be either byte or half-word (16-bit) as con-
figured by the CPU. All byte accesses are transferred through their natural byte lane only (odd
bytes on PCM_D[15:8] and even bytes on PCM_D[7:0]).
PC Card address bus: Single-mode. This is a byte address during byte operations and a half-
word address during half-word (16-bit) accesses (that is, A[0] is kept low).
Description
Card enables: Single-mode. These are the byte enable lines for the data bus.
PCM_CE_L[1] enables even bytes, D[7:0], and PCM_CE_L[2] enables odd bytes, D[15:8].
Output enable for memory read data. Single-mode. PCM_OE_L enables the card’s data
outputs. During a write operation, this signal is deasserted (high). During a card read DMA
transfer, this signal is used as a terminal count and is asserted along with PCM_IORD_L
during the last DMA card read.
Write enable signal for common memory and DMA: Single-mode. During a card write
DMA transfer, this signal is used as a terminal count and is asser ted along with
PCM_IOWR_L during the last DMA card write.
L
O G I C
C
O N F I D E N T I A L
, N D A R
PRELIMINARY DATA BOOK v1.0
E Q U I R E D
Low-Power PC Card Controller
November 1997
CL-PS6700