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13-20 Intel® PXA255 Processor Developer’s Manual
AC’97 Controller Unit
Channel specific data registers are for FIFO accesses and the PCM, Modem, and Mic-in FIFOs
each have a register. A write access to one of these registers updates the written data in the
corresponding Transmit FIFO. A read access to one of these registers flushes out an entry from the
corresponding Receive FIFO.
Note: Register tables show organization and individual bit definitions. All reserved bits are read as
unknown values and must be written with a 0. A question mark indicates the value is unknown at
reset.
Note: Some register bits receive status from CODECs. The CODEC status sets the bit and software clears
the bit (write a one to clear). The status can come in at any time, even when the bit is set or during
a software clear. If software clears the bit as the CODEC status updates the bit, the CODEC status
event takes higher priority. The term “interruptible” denotes bits that can be affected by this
condition.
13.8.3.1 Global Control Register (GCR)
This is a read/write register. Ignore reads from reserved bits. Write zeros to reserved bits.
Table 13-7. GCR Bit Definitions (Sheet 1 of 2)
Physical Address
4050_000C
GCR Register AC’97 Controller Unit
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
reserved
CDONE_IE
SDONE_IE
reserved
SECRDY_IEN
PRIRDY_IEN
reserved
SECRES_IEN
PRIRES_IEN
ACLINK_OFF
WARM_RST
COLD_RST
GIE
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bits Name Description
31:20 — reserved
19 CDONE_IE
Command Done Interrupt Enable (CDONE_IE):
0 = The ACUNIT does not trigger an interrupt to the CPU after sending the command
address and data to the CODEC.
1 = The ACUNIT triggers an interrupt to the CPU after sending the command address and
data to the CODEC.
18 SDONE_IE
Status Done Interrupt Enable (SDONE_IE):
0 = Interrupt is disabled
1 = Enables an interrupt to occur after receiving the status address and data from the
CODEC
17:10 — reserved
9SECRDY_IEN
Secondary Ready Interrupt Enable (SECRDY_IEN):
0 = Interrupt is disabled
1 = Enables an interrupt to occur when the Secondary CODEC sends the CODEC READY
bit on the SDATA_IN_1 pin
8PRIRDY_IEN
Primary Ready Interrupt Enable (PRIRDY_IEN):
0 = Interrupt is disabled
1 = Enables an interrupt to occur when the Primary CODEC sends the CODEC READY bit
on the SDATA_IN_0 pin.
7:6 — reserved