Motorola CPCI-6115 manual 4.16 MV64360 Reset Configuration, MPP Pin, Input/Output Function

Functional DescriptionMV64360 System Controller

Table 4-2 MV64360 MPP Pin Function Assignments (continued)

MPP Pin
Number	Input/Output	Function
22	I	CompactPCI Bus Interrupts - INTC#
23	I	CompactPCI Bus Interrupts - INTD#
		MPP[17:16] PCI_1 Interrupts
		MPP[19:18] PCI_0 Interrupts,
		MPP[23:20] CompactPCI Interrupts
24	O	MV64360 SROM initialization active (InitAct)
25	O	Watchdog Timer Expired output (WDE#)
26	O	Watchdog Timer NMI output (WDNMI#)
27	I	Unused
28	O	PCI Bus 0.0 - PMC 2 secondary grant (GNTB#)
29	I	PCI Bus 0.0 - PMC 2 secondary request (REQB#)
30	O	PCI Bus 0.0 - PMC 2 grant
31	I	PCI Bus 0.0 - PMC 2 request
		MPP[27:24] Miscellaneous
	MPP[31:28] PCI_0 Arbitration Request-Grant Pairs

4.3.4.16 MV64360 Reset Configuration

The MV64360 supports two methods of device initialization following reset:

zPins sampled on the deassertion of reset

zPartial pin sample on deassertion of reset plus serial ROM initialization via the I2C bus for user defined initialization.

The CPCI-6115 board supports both options. An onboard jumper setting is used to select the option. If the pin sample only method is selected, then states of the various pins on the device AD bus are sampled when reset is deasserted to determine the desired operating modes. The following table describes the configuration options. Combinations of pullups, pulldowns and jumpers are used to set the options. Some options are fixed and some are selectable at build time by installing the proper pullup/pulldown resistor. Finally, some options may be selected using an onboard jumper. Each option is described in the following table.

Using the SROM initialization method, any of the MV64360 internal registers or other system components (that is, devices on the PCI bus) can be initialized. Initialization takes place by sequentially reading 8 byte address/data pairs from the SROM and writing the 32-bit data to the decoded 32-bit address until the data pattern matching the last serial data item register is read from the SROM (default value 0xffffffff). An 8 KB EEPROM is provided onboard for this user defined initialization of the MV64360.

76 CPCI-6115 CompactPCI Single Board Computer Installation and Use (6806800A68D)