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CL-PS6700-VC-A

Low-Power PC Card Controller for the CL-PS7111

Cirrus Logic 

CL-PS6700

Low-Power PC Card Controller

OVERVIEW (cont.)

CL-PS7111-to-CL-PS6700 Interface

The PC Card interface requires a 26-bit address bus

and a 16-bit data bus. The interface between the

CL-PS6700 and CL-PS7111 consists of a 16-bit bus

that carries the address and data information, and

several control signals. This bus defines a two-clock

address phase during which the 26-bit PC Card

address and 6 control bits are transferred, and a

one- or two-clock data phase during which one or

four bytes of data are transferred. The data phase

for reads can be deferred (for example, for a DMA

access to the frame buffer of the CL-PS7111).

If a write transfer is indicated, write data appears in

the third clock phase. If a word write is indicated,

write data also appears in the fourth clock phase.

For read transfers, the CL-PS6700 drives the bus

with read data during the first one or two clocks of

the data phase. This interface bus is also shared by

other memory devices and up to one additional

CL-PS6700 device.

The CL-PS7111 accesses the CL-PS6700 as a

memory-mapped peripheral on the 16-bit memory

bus. A Chip Enable signal (NCS[4]) from the

CL-PS7111 selects one CL-PS6700 device for

access to a particular PC Card socket. Another Chip

Enable signal (NCS[5]) connects a second PC Card

socket.

The CL-PS6700 implements the low-level interface

to the PC Card socket and provides voltage transla-

tion for mixed-voltage systems. The CL-PS6700

also provides the data buffer and interrupt controls

for the PC Card. Transfers between the two devices

can be either one or four bytes.

The CL-PS6700 can be programmed to assem-

ble/disassemble CL-PS7111 transfers to the width

of the PC Card. The CL-PS6700 has read and write

buffers that allow posting of both reads and writes.

The read queue is single entry; the write FIFO can

queue up to four CL-PS7111 transactions (up to

16 bytes).

Hot Insertion Support

The CL-PS6700 PC Card controller allows PC

Cards to be inserted or removed while system

power is on. The CL-PS7111 controller typically

applies power to a PC Card socket after it has

detected a properly inserted card. The device

removes the power before the card is removed

(that is, when the CPU detects that the card lock is

deasserted). Since each card is isolated from the

system by the associated CL-PS6700, insertion

and removal of cards do not cause interference on

the system buses.

Card Configuration and Access

After power-on or reset, a PC Card defaults to a

memory-only card. The CL-PS7111 then reads the

CIS of the card to determine the card type, access

time, and so on, and configures the CL-PS6700 to

access the card.

Each PC Card’s VCC and VPP pins are individually

controlled by its associated CL-PS6700. The

CL-PS7111 controls the power to a card by writing

to the CL-PS6700 registers. The CL-PS6700

ensures that its signals to the sockets are in the

proper state before applying or removing power.

The CL-PS6700 device is available in an 100-pin

VQFP package. The device can be used with both

operating frequencies of the CL-PS7111 (13 and

18 MHz at 2.7 and 3.3 V).

2

OVERVIEW

CIRRUS LOGIC CONFIDENTIAL, NDA REQUIRED

PRELIMINARY DATA BOOK v1.0

November 1997

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