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DS31256 数据表(PDF) 79 Page - Maxim Integrated Products |
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DS31256 数据表(HTML) 79 Page - Maxim Integrated Products |
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79 / 183 page  DS31256 256-Channel, High-Throughput HDLC Controller 79 of 183 the data that is currently present in the RFHWM register and write it to the channel location indicated by the HCID 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: RFHWM Register Description: Receive FIFO High Watermark Register Address: 0924h Bit # 7 6 5 4 3 2 1 0 Name RHWM7 RHWM6 RHWM5 RHWM4 RHWM3 RHWM2 RHWM1 RHWM0 Default Bit # 15 14 13 12 11 10 9 8 Name n/a n/a n/a n/a n/a n/a RHWM9 RHWM8 Default Note: Bits that are underlined are read-only; all other bits are read-write. Bits 0 to 9/High Watermark (RHWM0 to RHWM9). These bits indicate the setting of the receive high- watermark. The high-watermark setting is the number of successive blocks that the HDLC controller writes to the FIFO before the DMA sends the data to the PCI bus. The high-watermark setting must be between (inclusive) one block and one less than the number of blocks in the link-list chain for the particular channel involved. For example, if four blocks are linked together, the high watermark can be set to either 1, 2, or 3. In other words, the high watermark can be set to a value of 1 to N - 1, where N = number of block linked together. Any other numbers are illegal. 0000000000 (000h) = invalid setting 0000000001 (001h) = high watermark is 1 block 0000000010 (002h) = high watermark is 2 blocks 0111111111 (1FFh) = high watermark is 511 blocks 1111111111 (3FFh) = high watermark is 1023 blocks Register Name: TFSBPIS Register Description: Transmit FIFO Starting Block Pointer Indirect Select Register Address: 0980h 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. |
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