DS21458-W+ Maxim Integrated, DS21458-W+ Datasheet - Page 91

• Manufacturer Part Number: DS21458-W+
• Description: Network Controller & Processor ICs
• Manufacturer: Maxim Integrated

Specifications of DS21458-W+

• Product: Framer
• Number Of Transceivers: 4
• Data Rate: 64 Kbps
• Supply Current (max): 328 mA
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: CSBGA
• Minimum Operating Temperature: 0 C
• Operating Supply Voltage: 3.3 V
• Supply Voltage - Max: 3.465 V
• Supply Voltage - Min: 3.135 V
• Part # Aliases: 90-21458+W00

16. DS0 MONITORING FUNCTION
The DS21455/DS21458 can monitor one DS0 64kbps channel in the transmit direction and one DS0
channel in the receive direction at the same time. In the transmit direction the user will determine which
channel is to be monitored by properly setting the TCM0 to TCM4 bits in the TDS0SEL register. In the
receive direction, the RCM0 to RCM4 bits in the RDS0SEL register need to be properly set. The DS0
channel pointed to by the TCM0 to TCM4 bits will appear in the transmit DS0 monitor (TDS0M) register
and the DS0 channel pointed to by the RCM0 to RCM4 bits will appear in the receive DS0 (RDS0M)
register. The TCM4 to TCM0 and RCM4 to RCM0 bits should be programmed with the decimal decode
of the appropriate T1 or E1 channel. T1 channels 1 through 24 map to register values 0 through 23. E1
channels 1 through 32 map to register values 0 through 31. For example, if DS0 channel 6 in the transmit
direction and DS0 channel 15 in the receive direction needed to be monitored, then the following values
would be programmed into TDS0SEL and RDS0SEL:
16.1 Transmit DS0 Monitor Registers
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bits 0 to 4 Transmit Channel Monitor Bits (TCM0 to TCM4). TCM0 is the LSB of a 5-bit channel select that determines
which transmit channel data will appear in the TDS0M register.
Bits 5 to 7/Unused, must be set to zero for proper operation.
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bits 0 to 7/Transmit DS0 Channel Bits (B1 to B8). Transmit channel data that has been selected by the transmit channel
monitor select register. B8 is the LSB of the DS0 channel (last bit to be transmitted).
B1
—
7
0
7
0
B2
—
TDS0SEL
Transmit Channel Monitor Select
74h
TDS0M
Transmit DS0 Monitor Register
75h
6
0
6
0
B3
—
5
0
5
0
TCM4 = 0
TCM3 = 0
TCM2 = 1
TCM1 = 0
TCM0 = 1
TCM4
B4
4
0
4
0
91 of 269
RCM4 = 0
RCM3 = 1
RCM2 = 1
RCM1 = 1
RCM0 = 0
TCM3
B5
3
0
3
0
DS21455/DS21458 Quad T1/E1/J1 Transceivers
TCM2
B6
2
0
2
0
TCM1
B7
1
0
1
0
TCM0
B8
0
0
0
0