cl-ps6700 Cirrus Logic, Inc., cl-ps6700 Datasheet - Page 16

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

2.2.3 Additional Control for I/O Signals
Signal
PCM_IORD_L
PCM_IOWR_L
2.2.4 Card Detect and Battery Status Signals
Signal
PCM_CD_L[2:1]
16
PCM_BVD[2:1]
PIN DESCRIPTIONS
Type
Type
O
I
I
Source
Power
Source
Power
pcm
VDDhi 00 – Card inserted
pcm
C
I R R U S
Description
Single-mode.
Dual-mode.
Memory Mode: These signals remain deasserted.
I/O Mode: These signals are asserted during read (PCM_IORD_L) and write transfer
(PCM_IOWR_L) to the card I/O space or DMA devices. A PC Card does not respond to these
signals unless it is configured for I/O by the system.
Description
01 – Card partially inserted
10 – Card partially inserted
11 – Card not inserted
Single-mode. These pins indicate whether a card has been inserted into a socket. They are
positioned at opposite ends of the connector to ensure valid detection of card insertion; a
properly inserted card pulls both lines low . They are pulled up to VDDhi within the
CL-PS6700 until a card is inserted (which pulls them low). These signals are available as
status bits in a register, and any state change can also cause an interrupt informing the sys-
tem that a card has been inserted or removed.
Dual-mode.
Memory Mode: These bits indicate the card battery condition as outlined in
I/O Mode: PCM_BVD[2] becomes SPKR_L, the Audio Digital Waveform signal, while
PCM_BVD[1] becomes the STSCHG_L signal, a status line that indicates state changes of
BVD, CD, and WP. The state of the BVD inputs can be read by the CPU in the CL-PS6700
Status registers and are also available on the PC Card registers.
Table 2-6.
PCM_BVD[2:1]
L
O G I C
X0
01
11
PC Card Battery Voltage Detect Encoding
C
O N F I D E N T I A L
Battery Condition
Battery dead
Battery low
Battery OK
, 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
Table
2-6.