PEB2466 SIEMENS [Siemens Semiconductor Group], PEB2466 Datasheet - Page 22

• Manufacturer Part Number: PEB2466
• Description: Four Channel Codec Filter with PCM- and m-Controller Interface SICOFI4-mC
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Semiconductor Group
2.3
The internal configuration registers, the signaling interface, and the Coefficient-RAM
(CRAM) of the SICOFI-4- C are programmable via a serial -Controller interface.
The -Controller interface consists of four lines: CS, DCLK, DIN and DOUT:
CS is used to start a serial access to the SICOFI-4- C registers and Coefficient-RAM.
Following a falling edge of CS, the first eight bits received on DIN specify the command.
Subsequent data bytes (number depends on command) are stored in the selected
configuration registers or the selected part of the Coefficient-RAM.
Figure 8
Example for a Write Access, with Two Data Bytes Transferred
If the first eight bits received via DIN specify a read-command, the SICOFI-4 will start a
response via DOUT with its specific address byte (81
identification, the specified n data bytes (contents of configuration registers, or contents
of the CRAM) will follow on DOUT.
CS
DCLK
DIN
DOUT
The -Controller Interface
7 6 5 4 3 2 1 0
Control
7
6
Data Byte 1
5
High ’Z’
4
22
3
2
1
0
7
6
Data Byte 2
5
H
4
). After transmitting this
Functional Description
3
2
1
0
PEB 2466
ITD07261
02.97