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79RC32K438233BBI Datasheet(PDF) 7 Page - Integrated Device Technology |
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79RC32K438233BBI Datasheet(HTML) 7 Page - Integrated Device Technology |
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7 / 59 page  7 of 59 May 25, 2004 IDT 79RC32438 PCIREQN[3:0] I/O PCI Bus Request. In PCI host mode with internal arbiter: These signals are inputs whose assertion indicates to the internal RC32438 arbiter that an agent desires ownership of the PCI bus. In PCI host mode with external arbiter: PCIREQN[0]: asserted by the RC32438 to request ownership of the PCI bus. PCIREQN[3:1]: unused and driven high. In PCI satellite mode: PCIREQN[0]: this signal is asserted by the RC32438 to request use of the PCI bus. PCIREQN[1]: function changes to PCIIDSEL and is used as a chip select during configuration read and write transactions. PCIREQN[3:2]: unused and driven high. Note: When the GPIO register is programmed in the alternate function mode for bits GPIO [24] and [27], these bits become PCIREQN [4] and [5] respectively. PCIRSTN I/O PCI Reset. In host mode, this signal is asserted by the RC32438 to generate a PCI reset. In satellite mode, assertion of this signal initiates a warm reset. PCISERRN I/O PCI System Error. This signal is driven by an agent to indicate an address par- ity error, data parity error during a special cycle command, or any other system error. Requires an external pull-up. PCISTOPN I/O PCI Stop. Driven by the bus target to terminate the current bus transaction. For example, to indicate a retry. PCITRDYN I/O PCI Target Ready. Driven by the bus target to indicate that the current data can complete. General Purpose Input/Output GPIO[0] I/O General Purpose I/O. This pin can be configured as a general purpose I/O pin. Alternate function pin name: U0SOUT Alternate function: UART channel 0 serial output. GPIO[1] I/O General Purpose I/O. This pin can be configured as a general purpose I/O pin. Alternate function pin name: U0SINP Alternate function: UART channel 0 serial input. GPIO[2] I/O General Purpose I/O. This pin can be configured as a general purpose I/O pin. Alternate function pin name: U0RIN Alternate function: UART channel 0 ring indicator input. GPIO[3] I/O General Purpose I/O. This pin can be configured as a general purpose I/O pin. Alternate function pin name: U0DCDN Alternate function: UART channel 0 data carrier detect input. GPIO[4] I/O General Purpose I/O. This pin can be configured as a general purpose I/O pin. Alternate function pin name: U0DTRN Alternate function: UART channel 0 data terminal ready input. GPIO[5] I/O General Purpose I/O. This pin can be configured as a general purpose I/O pin. Alternate function pin name: U0DSRN Alternate function: UART channel 0 data set ready input. Signal Type Name/Description Table 1 Pin Description (Part 4 of 9) |
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