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PM7367 数据表(PDF) 29 Page - PMC-Sierra, Inc |
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PM7367 数据表(HTML) 29 Page - PMC-Sierra, Inc |
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29 / 323 page ![]() PM7367 FREEDM-32P32 DATA SHEET PMC-1991499 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMER’S INTERNAL USE 15 Pin Name Type Pin No. Function AD[31] I/O D19 As an output bus, AD[31:0] is updated on the rising edge of PCICLK. As an input bus, AD[31:0] is sampled on the rising edge of PCICLK. C/BEB[0] C/BEB[1] C/BEB[2] C/BEB[3] I/O R19 M18 J20 G18 The PCI bus command and byte enable bus (C/BEB[3:0]) contains the bus command or the byte valid indications. During the first clock cycle of a transaction, C/BEB[3:0] contains the bus command code. For subsequent clock cycles, C/BEB[3:0] identifies which bytes on the AD[31:0] bus carry valid data. C/BEB[3] is associated with byte 3 (AD[31:24]) while C/BEB[0] is associated with byte 0 (AD[7:0]). When C/BEB[n] is set high, the associated byte is invalid. When C/BEB[n] is set low, the associated byte is valid. When the FREEDM-32P32 is the initiator, C/BEB[3:0] is an output bus. When the FREEDM-32P32 is the target, C/BEB[3:0] is an input bus. When the FREEDM-32P32 is not involved in the current transaction, C/BEB[3:0] is tri-stated. As an output bus, C/BEB[3:0] is updated on the rising edge of PCICLK. As an input bus, C/BEB[3:0] is sampled on the rising edge of PCICLK. |
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