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DS31256 数据表(PDF) 81 Page - Maxim Integrated Products |
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DS31256 数据表(HTML) 81 Page - Maxim Integrated Products |
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81 / 183 page  DS31256 256-Channel, High-Throughput HDLC Controller 81 of 183 Bits 0 to 9/Block ID (BLKID0 to BLKID9) 00000000000 (000h) = block number 0 01111111111 (1FFh) = block number 511 1111111111 (3FFh) = block number 1023 Bit 14/Indirect Access Read/Write (IARW). When the host wishes to read data from the internal transmit block pointer RAM, this bit should be written to 1 by the host. This causes the device to begin obtaining the data from the block location indicated by the BLKID bits. During the read access, the IAB bit is set to 1. Once the data is ready to be read from the TFBP register, the IAB bit is set to 0. When the host wishes to write data to the internal transmit block pointer RAM, this bit should be written to 0 by the host. This causes the device to take the data that is currently present in the TFBP register and write it to the channel location indicated by the BLKID bits. When the device has completed the write, the IAB is set to 0. Bit 15/Indirect Access Busy (IAB). When an indirect read or write access is in progress, this read-only bit is set to 1. During a read operation, this bit is set to 1 until the data is ready to be read. It is set to 0 when the data is ready to be read. During a write operation, this bit is set to 1 while the write is taking place. It is set to 0 once the write operation has completed. Register Name: TFBP Register Description: Transmit FIFO Block Pointer Register Address: 0994h Bit # 7 6 5 4 3 2 1 0 Name TBP7 TBP6 TBP5 TBP4 TBP3 TBP2 TBP1 TBP0 Default Bit # 15 14 13 12 11 10 9 8 Name n/a n/a n/a n/a n/a n/a TBP9 TBP8 Default Note: Bits that are underlined are read-only; all other bits are read-write . Bits 0 to 9/Block Pointer (TBP0 to TBP9). These bits indicate which of the 1024 blocks is the next block in the link list chain. A block is not allowed to point to itself. 0000000000 (000h) = block 0 is the next linked block 0111111111 (1FFh) = block 511 is the next linked block 1111111111 (3FFh) = block 1023 is the next linked block Register Name: TFLWMIS Register Description: Transmit FIFO Low-Watermark Indirect Select Register Address: 09A0h Bit # 7 6 5 4 3 2 1 0 Name HCID7 HCID6 HCID5 HCID4 HCID3 HCID2 HCID1 HCID0 Default 0 0 0 0 0 0 0 0 Bit # 15 14 13 12 11 10 9 8 Name IAB IARW n/a n/a n/a n/a n/a n/a Default 0 0 0 0 0 0 0 0 Note: Bits that are underlined are read-only, all other bits are read-write. Bits 0 to 7/HDLC Channel ID (HCID0 to HCID7) 00000000 (00h) = HDLC channel number 1 11111111 (FFh) = HDLC channel number 256 |
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