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79RC32334-150BBG Datasheet(PDF) 7 Page - Integrated Device Technology |
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79RC32334-150BBG Datasheet(HTML) 7 Page - Integrated Device Technology |
7 / 30 page 7 of 30 August 31, 2004 IDT 79RC32334—Rev. Y pci_rst_n Input L — PCI Reset Negated Host mode: Resets all PCI related logic. Satellite mode: Resets all PCI related logic and also warm resets the 32334. pci_devsel_n I/O Z PCI PCI Device Select Negated Driven by the target to indicate that the target has decoded the present address as a target address. pci_req_n[2] Input Z — PCI Bus Request #2 Negated Requires external pull-up. Host mode: pci_req_n[2] is an input indicating a request from an external device. Satellite mode: used as pci_idsel pin which selects this device during a configuration read or write. Alternate function: pci_idsel (satellite). pci_req_n[1] Input Z — PCI Bus Request #1 Negated Requires external pull-up. Host mode: pci_req_n[1] is an input indicating a request from an external device. Alternate function: Unused (satellite). pci_req_n[0] I/O Z High PCI Bus Request #0 Negated Requires external pull-up for burst mode. Host mode: pci_req_n[0] is an input indicating a request from an external device. Satellite mode: pci_req_n[0] is an output indicating a request from this device. pci_gnt_n[2] Output Z1 High PCI Bus Grant #2 Negated Recommend external pull-up. Host mode: pci_gnt_n[2] is an output indicating a grant to an external device. Satellite mode: pci_gnt_n[2] is used as the pci_inta_n output pin. Alternate function: pci_inta_n (satellite). pci_gnt_n[1] / pci_eeprom_cs I/O X for 1 pci clock then H2 High PCI Bus Grant #1 Negated Recommend external pull-up. Host mode: pci_gnt_n[1] is an output indicating a grant to an external device. Satellite mode: Used as pci_eprom_cs output pin for Serial Chip Select for loading PCI Configuration Registers in the RC32334 Reset Initialization Vector PCI boot mode. Defaults to the output direction at reset time. 1st Alternate function: pci_eeprom_cs (satellite). 2nd Alternate function: PIO[11]. pci_gnt_n[0] I/O Z High PCI Bus Grant #0 Negated Host mode: pci_gnt_n[0] is an output indicating a grant to an external device. Recommend external pull- up. Satellite mode: pci_gnt_n[0] is an input indicating a grant to this device. Require external pull-up. pci_inta_n Output Open- collector ZPCI PCI Interrupt #A Negated Uses pci_gnt_n[2]. See the PCI subsection. pci_lock_n Input — PCI Lock Negated Driven by the Bus Master to indicate that an exclusive operation is occurring. 1 Z in host mode; L in satellite non-boot mode; Z in satellite boot mode. 2 H in host mode; L in satellite non-boot and boot modes. X = unknown. SDRAM Control Interface sdram_addr_12 Output L High SDRAM Address Bit 12 and Precharge All SDRAM mode: Provides SDRAM address bit 12 (10 on the SDRAM chip) during row address and "pre- charge all" signal during refresh, read and write command. sdram_ras_n Output H High SDRAM RAS Negated SDRAM mode: Provides SDRAM RAS control signal to all SDRAM banks. Name Type Reset State Status Drive Strength Capability Description Table 1 Pin Description (Part 3 of 7) |
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