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数据搜索系统，热门电子元器件搜索 |
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CS5920 数据表(PDF) 77 Page - Applied Micro Circuits Corporation |
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CS5920 数据表(HTML) 77 Page - Applied Micro Circuits Corporation |
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77 / 160 page  S5920 – PCI Product Revision 1.01 – November 28, 2005 AMCC Confidential and Proprietary DS1596 77 Data Book ADD-ON INCOMING MAILBOX REGISTER (AIMB) ADD-ON OUTGOING MAILBOX REGISTER (AOMB) ADD-ON PASS-THRU ADDRESS REGISTER (APTA) ADD-ON PASS-THRU DATA REGISTER (APTD) Register Names: Incoming Mailbox This DWORD register provides a method for receiv-ing user-defined status or parameter data from the PCI system. Add-On bus read operations to this register may be of any width (byte, word, or DWORD). Only read operations are sup- ported. Reading from this register can optionally cause a PCI bus interrupt (if desired) by enabling interrupt generation through the use of the PCI’s Interrupt Control/Status Register. This register is also referred to as the PCI Outgoing Mail- box Register. Add-On Address: 0Ch Power-up value: XXXXXXXXh Add-On Attribute: Read Only Size: 32 bits Register Names: Outgoing Mailbox This DWORD register provides a method for sending command or parameter data to the PCI interface. Add-On bus operations to this register may be of any width (byte, word, or DWORD). Writing to this register can be a source for PCI bus interrupts (if desired) by enabling interrupt generation through the use of the PCI’s Interrupt Control/Status Register. This is also called the PCI Incoming Mail- box Register (IMB). Byte 3 of this mailbox can also be controlled via the external mailbox port. Reading from this register will not affect interrupts or the AMBEF Status Register. (OMB). Add-On Address: 1Ch Power-up value: XXXXXXXXh Add-On Attribute: Read/Write Size: 32 bits Register Name: Add-On Pass-Thru Address This register stores the address of any active Pass-Thru PCI bus cycle that has been accepted by the S5920. When one of the base address decode registers 1-4 encounters a PCI bus cycle which selects the region defined by it, this register stores that current cycle’s active address. This address is incremented after every 32-bit Pass-Thru data transfer. Add-On Address: 28h Power-up value: XXXXXXXXh Add-On Attribute: Read Only Size: 32 bits Register Name: Add-On Pass-Thru Data This register, along with APTA register, is used to perform Pass-Thru transfers. When one of the base address decode registers 1-4 encounters a PCI bus cycle which selects the region defined by it, the APTA register will contain that current cycle’s active address and the APTD will contain the data (PCI bus writes) or must be written with data (PCI bus reads). Wait states are generated on the PCI bus until this register is read (PCI bus writes) or this register is written (PCI bus reads) when in Passive mode. Add-On Address: 2Ch Power-up value: XXXXXXXXh Add-On Attribute: Read/Write Size: 32 bits |
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