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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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CS5320 Datenblatt(PDF) 71 Page - Applied Micro Circuits Corporation |
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CS5320 Datenblatt(HTML) 71 Page - Applied Micro Circuits Corporation |
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71 / 160 page  S5320 – PCI Match Maker: Operation Registers Revision 5.03 – June 14, 2006 AMCC Confidential and Proprietary DS1656 71 Data Sheet Add-On Mailbox Empty/full Status Register (AMBEF) This register provides empty/full visibility for each byte within the mailboxes. The empty/full status for the Add-On Incoming mailbox is displayed on bits 15 to 12 and the empty/full status for the Add-On Out-going mailbox is presented on bits 31 to 28. A value of 1 sig- nifies that a given mailbox has been written by one bus interface but has not yet been read by the correspond- ing destination interface. The Add-On bus incoming mailbox is used to transfer data from the PCI bus to the Add-On bus, and the Add-On outgoing mailbox is used to transfer data from the Add-On bus to the PCI bus. This register is also referred to as the PCI Mail- box Empty/Full Status Register (MBEF). Figure 31. Mailbox Empty/Full Status Register Register Name: Mailbox Empty/Full Status Add-On Address: 34h Power-up value: 00000000h Add-On Attribute: Read Only Size: 32 bits 0 31 Add-On Incoming Mailbox Status (RO) 0000 16 15 12 11 0000 27 28 Reserved Reserved Add-On Outgoing Mailbox Status (RO) |
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