SPRUGZ8D Datasheet, PDF (2110/3016 Pages) Texas Instruments – Technical Reference Manual

McASP Registers
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16.3.14 Receive Bit Stream Format Register (RFMT)
The receive bit stream format register (RFMT) configures the receive data format. The RFMT is shown in
Figure 16-50 and described in Table 16-23.
Figure 16-50. Receive Bit Stream Format Register (RFMT)
31
18
Reserved
R-0
15
14
13
12
8
7
RRVRS
RPAD
RPBIT
R/W-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
RSSZ
R/W-0
4
3
2
RBUSEL
R/W-0
17
16
RDATDLY
R/W-0
0
RROT
R/W-0
Table 16-23. Receive Bit Stream Format Register (RFMT) Field Descriptions
Bit Field
31-18 Reserved
17-16 RDATDLY
15 RRVRS
14-13 RPAD
12-8 RPBIT
Value Description
0 Reserved. The reserved bit location always returns the default value. A value written to this field has no
effect. If writing to this field, always write the default value for future device compatibility.
0-3h Receive frame sync delay of AXRn.
0 0-bit delay. The first receive data bit, AXRn, occurs in same ACLKR cycle as the receive frame sync
(AFSR).
1h 1-bit delay. The first receive data bit, AXRn, occurs one ACLKR cycle after the receive frame sync
(AFSR).
2h 2-bit delay. The first receive data bit, AXRn, occurs two ACLKR cycles after the receive frame sync
(AFSR).
3h Reserved.
Receive serial bitstream order.
0 Bitstream is LSB first. No bit reversal is performed in receive format bit reverse unit.
1 Bitstream is MSB first. Bit reversal is performed in receive format bit reverse unit.
0-3h Pad value for extra bits in slot not belonging to the word. This field only applies to bits when RMASK[n]
= 0.
0 Pad extra bits with 0.
1h Pad extra bits with 1.
2h Pad extra bits with one of the bits from the word as specified by RPBIT bits.
3h Reserved.
0-1Fh RPBIT value determines which bit (as read by the CPU or DMA from RBUF[n]) is used to pad the extra
bits. This field only applies when RPAD = 2h.
0 Pad with bit 0 value.
1h-1Fh Pad with bit 1 to bit 31 value.
2110
Multichannel Audio Serial Port (McASP)
SPRUGZ8D – 14 November 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated
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