Emerson IPMC7126E manual IDSEL Address Assignments for PCI Local Bus, 2. IDSEL Switch Settings S2

Chapter 3 Programming

Figure 3-2. IDSEL Switch Settings (S2)

	1	ON
S2-P1 = 1
	2		S2-P1=0
S2-P2 = 0			S2-P2 =1

MVME5100 and MVME5500 S2 Default Setting

ON

1 2

MVME6100 S2 Setting

The settings of SW2 determine the IDSEL used by the W83C553 PCI/ISA Bridge. It is important that the settings of P1 and P2 are neither both on nor both off, otherwise the device will be enumerated twice.

If	Then
The SW2-P1 is OFF	The W83C553’s IDSEL is connected to
	IDSELB (P12:34). The IDSEL is then
	determined by the carrier’s configuration of the
	IPMC site.
The SW2-P2 is OFF	The W83C553’s IDSEL is connected to AD11
	on the IPMC.
The IPMC761-002 is used on an	The SW2-P1 should be OFF and SW2-P2 set
MVME6100	ON for proper operation.
The IPMC761-002 is used on an	The SW2-P1 should be ON and SW2-P2 OFF
MVME5100 or MVME5500	to emulate the IPMC761-001.

IDSEL Address Assignments for PCI Local Bus

Legacy IDSEL assignment for the PCI-to-ISA Bridge (PIB) is maintained to ensure software compatibility between MVME2700 and MVME5100 while functioning in IPMC mode. The IPMC712 and IPMC761 boards have a switch (S2) that allows you to configure the board for the correct IDSEL connection to the Winbond chip, as described below:

■Connection to IDSEL, AD[11] on PMC connector pin P11-48 is selected when using the IPMC 712/761 with ECC VME boards MVME5100 and MVME5500 (boards released prior to the MVME6100)

■Connection to IDSEL, AD[16] on PMC connector pin P12-34 is selected when using the IPMC712/761 with the MVME6100 board

■Connection to IDSELB varies according to the base board:

–5100: No Connect

–5500: AD[17]

–6100: AD[21]

–PrPMC Carrier: AD[17]

IPMC7126E/7616E I/O Module Installation and Use (6806800A45B) 17