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PR31500ABC Datasheet(PDF) 9 Page - NXP Semiconductors |
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PR31500ABC Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 24 page Philips Semiconductors Preliminary specification MIPS PR31500 Poseidon embedded processor 1996 Sep 24 9 PIN # NAME AND FUNCTION TYPE NAME Memory Pins (continued) 117, 118 /CARD1CSH,L O These pins are the Chip Select signals for PCMCIA card slot 1. 112 /CARDREG O This pin is the /REG signal for the PCMCIA cards. 110 /CARDIORD O This pin is the /IORD signal for the PCMCIA IO cards. 111 /CARDIOWR O This pin is the /IOWR signal for the PCMCIA IO cards. 115 /CARDDIR O This pin is used to provide the direction control for bi-directional data buffers used for the PCMCIA slot(s). This signal will assert whenever /CARD2CSH or /CARD2CSL or /CARD1CSH or /CARD1CSL is asserted and a read transaction is taking place. 105 /CARD2WAIT I This pin is the card wait signal from PCMCIA card slot 2. 113 /CARD1WAIT I This pin is the card wait signal from PCMCIA card slot 1. Bus Arbitration Pins 167 /DREQ I This pin is used to request external arbitration. If the TESTSIU signal is high and the TESTSIU function has been enabled, then once /DGRNT is asserted, external logic can initiate reads or writes to PR31500 processor registers by driving the appropriate input signals. If the TESTSIU signal is low or the TESTSIU function has not been enabled, then PR31500 memory transactions are halted and certain memory signals will be tri-stated when /DGRNT is asserted in order to allow an external master to access memory. 166 /DGRNT O This pin is asserted in response to /DREQ to inform the external test logic or bus master that it can now begin to drive signals. Clock Pins 128 SYSCLKIN I This pin should be connected along with SYSCLKOUT to an external crystal which is the main PR31500 clock source. 129 SYSCLKOUT O This pin should be connected along with SYSCLKIN to an external crystal which is the main PR31500 clock source. 79 C32KIN I This pin along with C32KOUT should be connected to a 32.768 KHz crystal. 80 C32KOUT O This pin along with C32KIN should be connected to a 32.768 KHz crystal. 77 BC32K O This pin is a buffered output of the 32.768 KHz clock. CHI Pins 50 CHIFS I/O This pin is the CHI frame synchronization signal. This pin is available for use in one of two modes. As an output, this pin allows PR31500 to be the master CHI sync source. As an input, this pin allows an external peripheral to be the master CHI sync source and the PR31500 CHI module will slave to this external sync. 49 CHICLK I/O This pin is the CHI clock signal. This pin is available for use in one of two modes. As an output, this pin allows PR31500 to be the master CHI clock source. As an input, this pin allows an external peripheral to be the master CHI clock source and the PR31500 CHI module will slave to this external clock. 52 CHIDOUT O This pin is the CHI serial data output signal. 51 CHIDIN I This pin is the CHI serial data input signal. IO Pins 46, 107, 47, 108, 56, 64, 64 IO(6:0) I/O These pins are general purpose input/output ports. Each port can be independently programmed as an input or output port. Each port can generate a separate positive and negative edge interrupt. Each port can also be independently programmed to use a 16 to 24 msec debouncer. 30, 45 MFIO(1:0) I/O These pins are multi-function input/output ports. Each port can be independently programmed as an input or output port, or can be programmed for multi-function use to support vendor-dependent test signals (for debugging purposes only). Each port can generate a separate positive and negative edge interrupt. Note that 30 other multi-function pins are available for usage as multi-function input/output ports. These pins are named after their respective standard/normal function and are not listed here. Endian Processor Pin 29 /LB endian I Little/Big Endian. This pin, when pulled Low at power-up, configures the PR31500 as a Little Endian. When this pin is pulled High at power-up, it configures the PR31500 as a Big Endian processor. |
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