IDT79RC32438 Datasheet, PDF (7/59 Pages) Integrated Device Technology – IDTTM InterpriseTM Integrated Communications Processor

IDT 79RC32438
Signal
Type
Name/Description
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.
Table 1 Pin Description (Part 4 of 9)
7 of 59
May 25, 2004