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Intel® PXA26x Processor Family Developer’s Manual 14-11
Inter-Integrated Circuit Sound Controller
† SACR1 bits DRPL, DREC, and AMSL cross clock domains. They are registered in an internal clock domain
that is much faster than the BITCLK domain. It takes 4 BITCLK cycles and 4 internal clock cycles before
these controls are conveyed to the slower BITCLK domain. If the above control settings are modified at a rate
faster than (4 BITCLK + 4 internal clock) cycles, the last updated value in this time frame is stored in a
temporary register and is transferred to the BITCLK domain.
14.6.3 Serial Audio Controller I
2
S/MSB-Justified Status Register
(SASR0)
The Serial Audio Status Register (SASR0) is used for recording the status of the FIFOs and
I2SLINK. All bits are read-only. Table 14-7 shows the bit layout of SASR0.
Only 4 bits are assigned for TFL and RFL. Actual fill levels are interpreted as follows:
Actual_TFL(4:0) = {~TNF, TFL(3:0)}
Actual_RFL(4:0) calculation:
if (RFL(3:0) == 4’b0)
Actual_RFL(4:0) = {RNE, RFL(3:0)}
else
Actual_RFL(4:0) = {1’b0, RFL(3:0)}
Table 14-6. SACR1 Bit Descriptions
Physical Address
0x4040-0004
Serial Audio Controller I
2
S/MSB-
Justified Control Register
I
2
S Controller
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
ENLBF
DRPL
DREC
Reserved
AMSL
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
31:6 — Reserved
5ENLBF
ENABLE I
2
S/MSB INTERFACE LOOP BACK FUNCTION:
0 – I
2
S/MSB Interface Loop Back Function is Disabled
1 – I
2
S/MSB Interface Loop Back Function is Enabled
4DRPL
†
DISABLE REPLAYING FUNCTION OF I
2
S OR MSB-JUSTIFIED INTERFACE:
0 – Replaying Function is Enabled
1 – Replaying Function is Disabled
3DREC
†
DISABLE RECORDING FUNCTION OF I
2
S OR MSB-JUSTIFIED INTERFACE:
0 – Recording Function is Enabled
1 – Recording Function is Disabled
2:1 — Reserved
0AMSL
†
SPECIFY ALTERNATE MODE (I
2
S OR MSB-JUSTIFIED) OPERATION:
0 – Select I
2
S Operation Mode
1 – Select MSB-Justified Operation Mode