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DS26401 Datasheet(PDF) 191 Page - Dallas Semiconductor |
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DS26401 Datasheet(HTML) 191 Page - Dallas Semiconductor |
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191 / 309 page  DS26401 Octal T1/E1/J1 Framer 191 10.13.1 Mapping E1 Channels Onto a 1.544MHz Backplane The user can use the RSCLKM bit in RIOCR.4 to enable the receive elastic store to operate with a 1.544MHz backplane (24 channels / frame + F-bit). In this mode, the user can chose which of the E1 time slots will be ignored (not transmitted onto RSER) by programming the Receive Blank Channel Select registers (RBCS1-4). A logic 1 in the associated bit location will cause the DS26401 elastic store to ignore the incoming E1 data for that channel. Typically the user will want to program eight channels to be ignored. The default (power-up) configuration will ignore channels 25 to 32, so that the first 24 E1 channels are mapped into the 24 channels of the 1.544MHz backplane. In this mode the F-bit location at RSER is always set to 1. For example, if the user wants to ignore E1 time slots 0 (channel 1) and ts 16 (channel 17), the RBCS registers would be programmed as follows: RBCS1 = 01h RBCS2 = 00h RBCS3 = 01h RBCS4 = FCh Register Name: RBCS1, RBCS2, RBCS3, RBCS4 Register Description: Receive Blank Channel Select Registers Register Address: 0C0h, 0C1h, 0C2h, 0C3h (MSB) (LSB) CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1 RBCS1 CH16 CH15 CH14 CH13 CH12 CH11 CH10 CH9 RBCS2 CH24 CH23 CH22 CH21 CH20 CH19 CH18 CH17 RBCS3 CH32 CH31 CH30 CH29 CH28 CH27 CH26 CH25 RBCS4 Bits 0 to 7 / Receive Blank Channel Select for Channels 1 to 32 (RBCS1 to 32) 0 = do not ignore this channel (send to RSER) 1 = ignore this E1 channel (do not send to RSER) Note that when two or more sequential channels are chosen to be ignored, the receive slip zone select bit should be set to zero. If the ignore channels are distributed (such as 1, 5, 9, 13, 17, 21, 25, 29), then the RSZS bit can be set to one, which may provide a lower occurrence of slips in certain applications. |
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