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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) 43 Page - PMC-Sierra, Inc |
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PM7344 датащи(HTML) 43 Page - PMC-Sierra, Inc |
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43 / 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 27 Pin Name Type Pin No. Function RRA[0] Input 80 Receive Read Address LSB (RRA[0]). The RRA[0] signal is available on this pin when input MPHEN is high. RRA[0] is used (along with RRA[1]) to select the FIFO (and hence port) that is read from using the RRDMPHB signal. RRA[0] is sampled on the rising edge of RFCLK together with RRDMPHB. RRDENB[2] Receive Read Enable PHY #2 (RRDENB[2]). The RRDENB[2] signal is available on this pin when input MPHEN is low. RRDENB[2] is used to initiate reads from the receive FIFO of PHY #2. When sampled low using the rising edge of RFCLK (and the remaining three RRDENBs remain high), a byte is read from PHY #2's synchronous FIFO and output on bus RDAT[7:0] if one is available. When sampled high using the rising edge of RFCLK, no read is performed and RDAT[7:0] and RSOC are tristated. RRDENB[2] must operate in conjunction with RFCLK to access the FIFOs at a high enough instantaneous rate as to avoid FIFO overflows. The ATM layer device may deassert RRDENB[2] at anytime it is unable to accept another byte. |
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