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15.9.9 Set the Transmit Frame Length
Table 15-55. Register Bits Used to Set the Transmit Frame Length
Register
Bit
XCR1
14-8
XCR2
14-8
15.9.9.1 Selected Frame Length
The transmit frame length is the number of serial words in the transmit frame. Each frame can have one or
two phases, depending on the value that you load into the XPHASE bit.
If a single-phase frame is selected (XPHASE = 0), the frame length is equal to the length of phase 1. If a
dual-phase frame is selected (XPHASE = 1), the frame length is the length of phase 1 plus the length of
phase 2.
The 7-bit XFRLEN fields allow up to 128 words per phase. See
calculate the frame length. This length corresponds to the number of words or logical time slots or
channels per frame-synchronization pulse.
NOTE: Program the XFRLEN fields with [w minus 1], where w represents the number of words per
phase. For example, if you want a phase length of 128 words in phase 1, load 127 into
XFRLEN1.
XPHASE
0
0 ≤ XFRLEN1 ≤ 127
1
0 ≤ XFRLEN1 ≤ 127
SPRUH22I – April 2012 – Revised November 2019
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Name
Function
XFRLEN1
Transmit frame length 1
(XFRLEN1 + 1) is the number of serial words in phase 1 of the
transmit frame.
XFRLEN1 = 000 0000
XFRLEN1 = 000 0001
|
|
XFRLEN1 = 111 1111
XFRLEN2
Transmit frame length 2
If a dual-phase frame is selected, (XFRLEN2 + 1) is the
number of serial words in phase 2 of the transmit frame.
XFRLEN2 = 000 0000
XFRLEN2 = 000 0001
|
|
XFRLEN2 = 111 1111
Table 15-56. How to Calculate Frame Length
XFRLEN1
XFRLEN2
Don't care
0 ≤ XFRLEN2 ≤ 127
Copyright © 2012–2019, Texas Instruments Incorporated
1 word in phase 1
2 words in phase 1
|
|
128 words in phase 1
1 word in phase 2
2 words in phase 2
|
|
128 words in phase 2
Table 15-56
for a summary of how to
Frame Length
(XFRLEN1 + 1) words
(XFRLEN1 + 1) + (XFRLEN2 + 1) words
C28 Multichannel Buffered Serial Port (McBSP)
Transmitter Configuration
Type
Reset Value
R/W
000 0000
R/W
000 0000
1103
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