Technical data

PMC Interrupts

4-5

❏ The lower two primary address bits AD(1:0) are 01 (binary)

❏ The device number in AD(15:11) is 1_1111 (binary)

❏ The function number in AD(10:8) is 111 (binary)

❏ The register number in AD(7:2) is 00_0000 (binary)

❏ The bus number in AD(23:16) is $01 (i.e., the value in the

Secondary Bus Number Register)

❏ The bus command on C/BE# is a configuration write command

The 21150 translates the Type 1 Configuration command to a Special

Cycle and forwards the address and data unchanged. The transaction is

forwarded as a delayed transaction but the target response is not forwarded

back because Special Cycles result in a master abort. If more than one data

transfer is requested during a Special Cycle, the 21150 responds with a

target disconnect during the first data phase.

PMC Interrupts

The routing of interrupts from each PMC adapter is described in Table 4-2.

Figure 4-2 and Figure 4-3 show the overall routing back to the Raven chip

on the VME processor modules.

Table 4-2. PMC Interrupt Routing

Device on

Secondary Bus

(Hex)

Device

(PMC Adapter)

Interrupt Pin

PCI Interrupt

02 (PMC 1) INTA# INTC#

INTB# INTD#

INTC# INTA#

INTD# INTB#