Emerson IPMC7616E ISA Local Resource Bus, Static ROM SROM, Super I/O, Escc, PCI-to-ISA Bridge PIB

Chapter 1 Product Features

ISA Local Resource Bus

PCI-to-ISA Bridge (PIB)

The PIB (W83C554F) contains the ISA Bridge I/O Registers necessary for various functions. These registers are also accessible from the PCI bus.

Super I/O

The Super I/O device (PC97307) provides the following functions on the IPMC:

■Two synchronous serial ports (COM1 and COM2)

■Parallel printer port

ESCC

Two DTE synchronous/asynchronous serial ports are provided by the ESCC device (Z85230). Since the Z85230 device does not have all modem control lines, a Z8536 CIO device (described below) is used to provide the missing lines.

A PAL device is used to perform decode for the Z85230 and the Z8536 for register accesses and pseudo interrupt acknowledge cycles in the ISA I/O space. DMA supports for the Z85230 is provided by the PIB.

The clock input to the Z85230 PCLK pin is a 10 MHz clock. The Z85230 supplies an interrupt vector during a pseudo interrupt acknowledge cycle. The vector is modified based upon the interrupt source within the device.

All modem control lines from the ESCC are multiplexed/demultiplexed through connector P2 by the P2MX function due to pin limitation of the connector.

CIO

The CIO device (Z8536) is used to provide the modem control lines not provided by the Z85230 ESCC. In addition, the device has three independent 16-bit counters/timers. The clock input to the Z8536 PCLK pin is a 5 MHz clock.

Static ROM (SROM)

Both modules contains one +3.3V, 256 x 8 serial EEPROM device (AT24C02) onboard. This device provides for Vital Product Data (VPD) storage of the module hardware configuration. The serial EEPROM is located on the baseboard’s I2C bus at address $A4.

8IPMC7126E/7616E I/O Module Installation and Use (6806800A45B)