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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM7344 датащи(PDF) 49 Page - PMC-Sierra, Inc |
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PM7344 датащи(HTML) 49 Page - PMC-Sierra, Inc |
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49 / 293 page  PM7344 S/UNI-MPH DATA SHEET PMC-950449 ISSUE 6 MULTI-PHY USER NETWORK INTERFACE PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 33 Pin Name Type Pin No. Function TWA[1] Input 63 Transmit Write Address MSB (TWA[1]). The TWA[1] signal is available on this pin when input MPHEN is high. TWA[1] is used (along with TWA[0]) to select the FIFO (and hence port) that is written to using the TWRMPHB signal. TWA[1] is sampled on the rising edge of TFCLK together with TWRMPHB. TWRENB[3 ] Transmit Write Enable PHY #3 (TWRENB[3]). The TWRENB[3] signal is available on this pin when input MPHEN is low. TWRENB[3] is used to initiate writes to the transmit FIFO of PHY #3. When sampled low using the rising edge of TFCLK (and the remaining three TWRENBs remain high), a byte is written to PHY #3's synchronous FIFO. When sampled high using the rising edge of TFCLK, no write is performed. TWRENB[3] must operate in conjunction with TFCLK to access the FIFOs at a high enough instantaneous rate as to avoid FIFO overflows. The ATM layer device may deassert TWRENB[3] at anytime it is unable to provide another byte. |
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