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DS26401 Datasheet(PDF) 69 Page - Dallas Semiconductor |
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DS26401 Datasheet(HTML) 69 Page - Dallas Semiconductor |
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69 / 309 page  DS26401 Octal T1/E1/J1 Framer 69 8.10 DS0 Monitoring Function The DS26401 can monitor one DS0 (64kbps) channel in the transmit direction and one DS0 channel in the receive direction at the same time. In the receive direction, the RCM0 to RCM4 bits in the RDS0SEL register need to be properly set and the DS0 channel pointed to by the RCM0 to RCM4 bits will appear in the receive DS0 (RDS0M) register. The RCM4 to RCM0 bits should be programmed with the decimal decode of the appropriate T1 channel. T1 channels 1 through 24 map to register values 0 through 23. For example, if DS0 channel 15 in the receive direction needed to be monitored, then the following values would be programmed into RDS0SEL: RCM4 = 0 RCM3 = 1 RCM2 = 1 RCM1 = 1 RCM0 = 0 Register Name: RDS0SEL Register Description: Receive-Channel Monitor Select Register Address: 012h + (200h x n) : where n = 0 to 7, for Ports 1 to 8 Bit # 7 6 5 4 3 2 1 0 Name — — — RCM4 RCM3 RCM2 RCM1 RCM0 Default 0 0 0 0 0 0 0 0 Bits 0 to 4 / Receive-Channel Monitor Bits (RCM0 to RCM4). RCM0 is the LSB of a 5-bit channel select that determines which receive-DS0 channel data appears in the RDS0M register. Bits 5–7 / Unused. Must be set = 0 for proper operation. Register Name: RDS0M Register Description: Receive-DS0 Monitor Register Register Address: 060h + (200h x n) : where n = 0 to 7, for Ports 1 to 8 Bit # 7 6 5 4 3 2 1 0 Name B1 B2 B3 B4 B5 B6 B7 B8 Default 0 0 0 0 0 0 0 0 Bits 0 to 7 / Receive-DS0 Channel Bits (B1 to B8). Receive-channel data that has been selected by the receive- channel monitor select register. B8 is the LSB of the DS0 channel (last bit to be received). |
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