Rev. 3.0, 03/01, page 187 of 390
Control Register (CR) [cont’d]
Bit
Description
Default
6
Mode Select: (MS): ( for CS4218 or CS4271)
1:the serial CODEC interface is master.
0:the serial CODEC interface is slave.
MS must be 1 for CS4271
0
5
Start Transfer (ST): ( for SM3-slave mode or AC97): Writing 1 to this bit will start
transmitting or receiving data. Writing 0 has no meaning.
This bit is always read 0.
0
4
Continue Run Enable (CRE): ( for SM3-slave mode or AC97)
1: SSYNC continues to be generated after transfer starts
0: SSYNC generation is not to be continued.
0
3
Flush TX FIFO (FTF): Setting this bit will flush TX FIFO, and resets the TX FIFO pointer.
Always read 0.
0
2
TX Enable (TXEN)
1: Enables TX done interrupt and the control of transmit data path.
0: Disabled
0
1
Flush RX FIFO (FRF): Setting this bit will flush RX FIFO, and reset the RX FIFO pointer.
Always read 0.
0
0
RX Enable(RXEN)
1: Enables RX done interrupt and the control of receive data path.
0: Disabled
0
14.2.4
Status Register (SR)
SR is a 16-bit Read only register that is used to reflect the status of this Serial CODEC Interface
when the CODEC is CS4271 or CS4218. If the CODEC is AC97 CODEC, this register has no
meaning. Bit 15 and bits 7 - 6 of this register are reserved. The other bits of this register are
initialized to 0 at reset. SR is not initialized in STANDBY mode.
Bit
15
14
13
12
11
10
9
8
Bit Name
reserved IR71
TNF
TFS1
TFS0
TFU
TFO
TDI
Initial Value
0
0
1
0
0
0
0
0
R/W
-
R
R
R
R
R
R
R
Bit
7
6
5
4
3
2
1
0
Bit Name
reserved reserved RNE
RFS1
RFS0
RFU
RFO
RDI
Initial Value
0
0
0
0
0
0
0
0
R/W
-
-
R
R
R
R
R
R
Summary of Contents for HD64465
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