CLRC63201TSLASH0FE datasheet(131/163 Pages) PHILIPS

131 / 163 page

Philips Semiconductors

Product Specification Rev. 3.0; May 2003

Multiple Protocol Contactless Reader IC

CL RC632

131

Confidential

18.6.1.3 Timing Diagram

The following diagram shows programming of 5 bytes into the E²PROM:

Explanation: It is assumed, that the CL RC632 finds and reads Byte 0 before the µ-Processor is able to write

Byte 1 (tprog,del = 300 ns). This causes the CL RC632 to start the programming cycle, which needs about

tprog = 5.8 ms. In the meantime the µ-Processor stores Byte 1 to Byte 4 to the FIFO buffer. Assuming, that the

E²PROM starting byte-address is e.g. 16Chex then Byte 0 is stored exactly there. The CL RC632 copies the

following data bytes into the E²PROM input buffer. Copying Byte 3, it detects, that this data byte has to be

programmed at the E²PROM byte-address 16Fhex. Since this is the end of the memory block, the CL RC632

automatically starts a programming cycle. In the next turn, Byte 4 will be programmed at the E²PROM byte-

address 170hex. Since this is the last data byte, the flags (E2Ready and TxIRq) that indicate the end of the

E²PROM programming activity will be set.

Although all data has been programmed into the E2PROM, the CL RC632 stays in the WriteE2-Command.

Writing further data to the FIFO would lead to further E²PROM programming, continuing at the E²PROM

byte-address 171hex. The command is stopped using the Idle-Command.

18.6.1.4 Error Flags for the WriteE2 Command

Programming is inhibited for the E²PROM blocks 0 (E²PROM’s byte-address 00hex to 0Fhex). Programming to

these addresses sets the flag AccessErr. No programming cycle is started. Addresses above 1FFhex are

taken modulo 200hex (for the E²PROM memory organisation, refer to chapter 6.).

NWrite

Data

WriteE2

command active

E²PROM

Programming

E2Ready

TxIRq

Write

Adr

LSB

Adr

MSB

Byte0

Byte1

Byte2

Byte3

Byte4

Programming Byte0

Programming Byte1, Byte2, and Byte3

Programming Byte4

prog

prg,del

Idle

Cmd

Figure 18-7: Timing Diagram for E²PROM programming

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