Philips Semiconductors

Product specification

PCK2001M

1999 Jul 06

8

1) Address assignment: The clock driver in this specification uses the single, 7-bit address shown below. All devices can use the address if only

the system.

The following address was confirmed by Philips on 09/04/96.

A6

A5

A4

A3

A2

A1

A0

R/W#

11

01

00

10

indicates a request for data (READ) from the clock driver. Since the definition of the clock buffer only allows the controller to WRITE data; the

R/W# bit of the address will always be seen as ‘zero’. Optimal address decoding of this bit is left to the vendor.

2) Options: It is our understanding that metal mask options and other pinouts of this type of clock driver will be allowed to use the same address

3) Slave/Receiver: The clock driver is assumed to require only slave/receiver functionality. Slave/transmitter functionality is optional.

4) Data Transfer Rate: 100 kbits/s (standard mode) is the base functionality required. Fast mode (400 kbits/s) functionality is optional.

based on a 3.3 Volt supply.

6) Data Byte Format: Byte format is 8 Bits as described in the following appendices.

The bytes must be accessed in sequential order from lowest to highest byte with the ability to stop after any complete byte has been

controller. The controller ‘‘writes” to the clock driver and if possible would ‘‘read” from the clock driver (the clock driver is a slave/receiver only

and is incapable of this transaction.)

‘‘The block write begins with a slave address and a write condition. After the command code the host (controller) issues a byte count which

describes how many more bytes will follow in the message. If the host had 20 bytes to send, the first byte would be the number 20 (14h),

followed by the 20 bytes of data. The byte count may not be 0. A block write command is allowed to transfer a maximum of 32 data bytes.”

SW00279

1 bit

7 bits

1

1

8 bits

1

Start bit

Slave Address

R/W

Command Code

Byte Count = N

Ack

Data Byte 1

Ack

Data Byte 2

Ack

...

Data Byte 2

Ack

Stop

Ack

Ack

1 bit

8 bits

1

1

8 bits

1

8 bits

1

NOTE: The acknowledgement bit is returned by the slave/receiver (the clock driver).

Consider the command code and the byte count bytes required as the first two bytes of any transfer. The command code is software

programmable via the controller, but will be specified as 0000 0000 in the clock specification. The byte count byte is the number of additional

bytes required to transfer, not counting the command code and byte count bytes. Additionally, the byte count byte is required to be a minimum of

1 byte and a maximum of 32 bytes to satisfy the above requirement.