Technical data

PMCspan PMC Carrier Module Installation and Use (6806800A59B)

4 Programming Model

Type 0 Configuration Cycles

Type 0 configuration cycles are issued to configure devices on the same bus as the initiator. The

processor will access configuration registers within the PCI6150, issuing a Type 0 cycle on the

primary PCI bus by programming the Raven CONADD Register for Bus Number 0, and Device

Number 1_0100 (binary). The Function Code is ignored by the PCI6150 since it is a single-

function device. The RAVEN chip will translate this configuration address to an IDSEL# on

AD20, which is connected to the DEVSEL# on the PCI6150 on the PMCspan.

The PCI6150 limits all configuration register accesses to a single double word data transfer and

returns a target disconnect with the first data transfer if additional data phases are requested.

All bytes of the requested double word are returned, regardless of the PCI byte enable bits.

Type 0 configuration transactions do not use the PCI6150 data buffers so these transactions

are completed immediately regardless of the state of the data buffers.

The PCI6150 will ignore all Type 0 transactions initiated on the secondary PCI bus.

Type 1 Configuration Cycles

Type 1 configuration cycles are issued to configure PMC modules. The processor will access

configuration registers within the PMC modules by issuing a Type 1 cycle on the primary PCI

bus by programming the Raven CONADD Register for Bus Number $01 (i.e., the Bus Number

programmed into the Secondary Bus Number register), and the Device Number per Table 4-3.

The Function Code is dependent on the PMC modules.

The PCI6150 will perform a Type 1 to Type 0 translation when the Type 1 transaction generated

on the primary bus is intended for a PMC module on the secondary bus. The PMC module can

then respond to the Type 0 transaction.

Table 4-2. Register 6-1 (PCIIDR; PCI:00h) PCI Configuration ID

Bit Description Read Write Walue after

Reset

15:0 Vendor ID, identifies PCI6150

manufacturer. Defaults to the PCI-

SIG-issued PLX Vendor ID (3388h) if

a blank or no serial EEPROM is

present.

Yes Only if

RRC[7]=1;Seri

al EEPROM

3388h

31:16 Device ID. Identifies the particular

device. Defaults to PLX PCI6150

part number (0022h) if a blank or no

serial EEPROM is present

Yes Only if

RRC[7]=1;Seri

al EEPROM

0022h