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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) 44 Page - PMC-Sierra, Inc |
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PM7344 датащи(HTML) 44 Page - PMC-Sierra, Inc |
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44 / 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 28 Pin Name Type Pin No. Function RRA[1] Input 81 Receive Read Address MSB (RRA[1]). The RRA[1] signal is available on this pin when input MPHEN is high. RRA[1] is used (along with RRA[0]) to select the FIFO (and hence port) that is read from using the RRDMPHB signal. RRA[1] is sampled on the rising edge of RFCLK together with RRDMPHB. RRDENB[3] Receive Read Enable PHY #3 (RRDENB[3]). The RRDENB[3] signal is available on this pin when input MPHEN is low. RRDENB[3] is used to initiate reads from the receive FIFO of PHY #3. When sampled low using the rising edge of RFCLK (and the remaining three RRDENBs remain high), a byte is read from PHY #3'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[3] 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[3] at anytime it is unable to accept another byte. |
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