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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DM9010BEP датащи(PDF) 21 Page - Davicom Semiconductor, Inc. |
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DM9010BEP датащи(HTML) 21 Page - Davicom Semiconductor, Inc. |
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21 / 62 page  DM9010B Single Chip Ethernet Controller with General Processor Interface Preliminary 21 Version: DM9010B--DS-P01 September 5, 2007 6.9 Back Pressure Threshold Register (08H) Bit Name Default Description 7:4 BPHW PHS3, RW Back Pressure High Water Overflow Threshold. MAC will generate the jam pattern when RX SRAM free space is lower than this threshold value Default is 3K-byte free space. Please do not exceed SRAM size (1 unit=1K bytes) :0 JPT PHS7, RW Jam Pattern Time. Default is 200us bit3 bit2 bit1 bit0 time 0 0 0 0 5us 0 0 0 1 10us 0 0 1 0 15us 0 0 1 1 25us 0 1 0 0 50us 0 1 0 1 100us 0 1 1 0 150us 0 1 1 1 200us 1 0 0 0 250us 1 0 0 1 300us 1 0 1 0 350us 1 0 1 1 400us 1 1 0 0 450us 1 1 0 1 500us 1 1 1 0 550us 1 1 1 1 600us 6.10 Flow Control Threshold Register (09H) Bit Name Default Description 7:4 HWOT PHS3, RW RX FIFO High Water Overflow Threshold Send a pause packet with pause_ time=FFFFH when the RX RAM free space is less than this value., If this value is zero, its means no free RX SRAM space. Default is 3K-byte free space. Please do not exceed SRAM size (1 unit=1K bytes) 3:0 LWOT PHS8, RW RX FIFO Low Water Overflow Threshold Send a pause packet with pause time=0000 when RX SRAM free space is larger than this value. This pause packet is enabled after the high water pause packet is transmitted. Default SRAM free space is 8K-byte. Please do not exceed SRAM size (1 unit=1K bytes) 6.11 RX/TX Flow Control Register (0AH) Bit Name Default Description 7 TXP0 HPS0,RW TX Pause Packet Auto clears after pause packet transmission completion. Set to TX pause packet with time = 0000h 6 TXPF HPS0,RW TX Pause packet Auto clears after pause packet transmission completion. Set to TX pause packet with time = FFFFH 5 TXPEN HPS0,RW Force TX Pause Packet Enable Enables the pause packet for high/low water threshold control |
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