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PM4351 Datasheet(PDF) 51 Page - PMC-Sierra, Inc |
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PM4351 Datasheet(HTML) 51 Page - PMC-Sierra, Inc |
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51 / 485 page  STANDARD PRODUCT PM4351 COMET DATA SHEET PMC-1970624 ISSUE 10 COMBINED E1/T1 TRANSCEIVER PROPRIETARY AND CONFIDENTIAL 27 Pin No. Pin Name Type -RI -NI Function RDB Input 23 G3 Active Low Read Enable (RDB). RDB is pulsed low to enable a COMET register read access. The COMET drives the D[7:0] bus with the contents of the addressed register while RDB and CSB are both low. WRB Input 24 J2 Active Low Write Strobe (WRB). WRB is pulsed low to enable a COMET register write access. The D[7:0] bus contents are clocked into the addressed normal mode register on the rising edge of WRB while CSB is low. ALE Input 45 G9 Address Latch Enable (ALE). This signal latches the address bus contents, A[8:0], when low, allowing the COMET to be interfaced to a multiplexed address/data bus. When ALE is high, the address latches are transparent. D[0] D[1] D[2] D[3] D[4] D[5] D[6] D[7] I/O 26 27 28 29 32 33 34 35 H3 J4 H4 F4 G5 F5 H6 J7 Bi-directional Data Bus (D[7:0]). This bus is used during read and write accesses to internal COMET registers. A[0] A[1] A[2] A[3] A[4] A[5] A[6] A[7] A[8] Input 36 37 38 39 40 41 42 43 44 J6 H5 H7 J8 G6 J9 H8 G7 H9 Address bus (A[8:0]). This bus selects specific registers during COMET register accesses. RSTB Input 22 H2 Active Low Reset (RSTB). When forced low, RSTB will asynchronously reset the COMET. RSTB is a Schmitt-trigger input with integral pull-up. When resetting the device, RSTB must be asserted for a minimum of 100 ns to ensure that the COMET is completely reset. INTB OD Output 25 J3 Active Low Open-drain Interrupt (INTB). INTB drives low when an unmasked interrupt event is detected on any of the internal interrupt sources. Note that INTB will remain low until all active, unmasked interrupt sources are acknowledged at their source at which time, INTB will tristate. |
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