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TNETX3270 数据表(PDF) 10 Page - Texas Instruments |
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TNETX3270 数据表(HTML) 10 Page - Texas Instruments |
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10 / 66 page  TNETX3270 ThunderSWITCH ™ 24/3 ETHERNET™ SWITCH WITH 24 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS SPWS043B – NOVEMBER 1997 – REVISED APRIL 1999 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions (Continued) host DIO interface TERMINAL I/O INTERNAL DESCRIPTION NAME NO. I/O RESISTOR DESCRIPTION SAD1 SAD0 143 142 I Pullup DIO address bus. SAD1 and SAD0 select the internal host registers, when SDMA is high. SCS 138 I Pullup DIO chip select. When low, SCS indicates a DIO port access is valid. SDMA 123 I Pullup DIO DMA select. When low, SDMA modifies the behavior of the DIO interface to allow it to operate with an external DMA controller. The SAD0 and SAD1 terminals are not used to select the internal host register for the access. Instead, the DIO address to access is provided by the DMA address register, and one of two host register addresses is selected according to DMAinc in the Syscontrol register. – If DMAinc = 1, accesses are the DIOdatainc register and DMAaddress increments after each access. – If DMAinc = 0, accesses are the DIOdata register, and DMAaddress does not increment after each address. SDATA7 SDATA6 SDATA5 SDATA4 SDATA3 SDATA2 SDATA1 SDATA0 136 135 133 131 130 129 127 126 I/O Pullup DIO data interface bus (byte-wide bidirectional DIO port). SDATA7 is the most significant bit and SDATA0 is the least significant bit. SINT 140 O None DIO interrupt line (interrupt to the attached microprocessor). The interrupt originating event is stored in the Int register. SRDY 139 O Pullup DIO ready signal – When low during reads, SRDY indicates to the host when data is valid to be read. – When low during writes, SRDY indicates when data has been received after SCS is taken high. SRDY is driven high for one clock cycle before placing the output in high impedance. SRNW 125 I Pullup DIO read not write – When high, read operation is selected. – When low, write operation is selected. SRXRDY 145 O None Network management port, receive ready. When high, SRXRDY indicates that the network management port’s RX buffers are empty and the network management port is able to receive a frame. STXRDY 144 O None Network management port, transmit ready. STXRDY indicates that at least one frame buffer is available to be read by the management CPU. – It outputs as a 1 if any of the end-of-frame (EOF) bits, start-of-frame (SOF) bits, or one of the bits in NMTxcontrol is set to 1. – Otherwise, it outputs 0. |
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