MT90812 Mitel Networks Corporation, MT90812 Datasheet - Page 74

• Manufacturer Part Number: MT90812
• Description: Integrated Digital Switch (IDX)
• Manufacturer: Mitel Networks Corporation

MT90812
22.27 HRA CTRL Register 1(HC1)
The register is configured as follows:
70
Read/Write Address is: 50
Reset Value is: 01
5-4
1-0
Bit
7
6
3
2
BRSEL1-0
PRXSEL
SFLAG
Name
CD
EN
SFLAG
-
7
H
PRXSEL
Software Controlled Flag Detect (SFLAG). SFLAG is used to allow the system to
inject a flag (indicating that a peripheral request-to-send has been detected). This bit
can be written asynchronously, has exactly the same effect as the normal flag
generated by the Auto-hunt circuitry, and is cleared automatically by the RX circuitry
when it has been used. On reset, this bit is cleared.
Present Receive Channel Select (PRXSEL). Normally low. This bit is set high if the
receive channel is to be selected via DRXi; unlike DDRX, however, CTS is not
disabled and RXCHNL and RXACT are not held high. Instead, the receiver can be
exercised by manipulating SREOP and SFLAG in a manner similar to normal
multiplexed operation. Primarily intended as a test mode. On reset, this bit is cleared.
Unused.
ENABLE HRA. If 0, disables HRA block. If 1 the HRA block is enabled.
0 = D before C-Channel. The D-channel is transferred before the C-channel following
the Frame Pulse. The D-channels are located in the first 16 of the 32 channels of STi/
o1 stream.
1 = C before D-Channel. The C-channel is transferred before the D-channel following
the Frame Pulse. The D-channels are located in channels 16-31 of STi/o1 stream.
Baud Rate Select. The Baud Rate Select field controls the number of bit times
actually used for D-channel activity within a selected transmit or receive channel time.
It also controls the rate at which the Auto-hunt circuitry monitors peripherals for
request-to-sends. During inactive bit times within an active channel, idles are
generated and output. One active bit gives a baud rate of 8K, while eight active bits
gives a baud rate of 64K.
00 8K
01 16K
10 64K
11 Unused.
On reset, 16K baud rate will be selected.
H
6
-
5
-
4
EN
3
Description
CD
2
BRSEL1
1
Advance Information
BRSEL0
0