RadiSys EPS-6315, Hardware Reference Manual, Page: 65 / 123

Chapter 5: Theory of operation
55
• Integrated Watchdog Timer :
Detects system lockup.
Flexible hardware reset or interrupt on timeout.
• General Purpose Digital I/O :
Multiplexed with other pin functions.
576 pin BGA package.
Power-up configuration
The following 82600 configuration options are determined during a PWRGOOD
reset, using pull-up or pull-down resistors on memory address lines:
1
This non-standard option is provided by resistor strapping options.
The 82600 does not support the LOCK function on the local PCI or the
BPCI buses.
Table 5-1. Power-up configuration settings
Address Description
ADDR0 10K pull-down General-purpose I/O pins on the 82600 are used as EIDE
data bus. (Default = EIDE).
ADDR1 10K pull-down General-purpose I/O pins are used for bus arbitration
signals ~BREQ[6:3] and ~BGNT[6:3]. (Default: GPIO).
ADDR2 and
ADDR5 Combination determines Monarch/non-Monarch mode
as shown below.
ADDR2 ADDR5 Mode
0 0
Central resource with arbiter.
1
1 0 Peripheral (non-Monarch).
0 1 Central resource without arbiter
(Monarch).
1 1 Not allowed.
ADDR3 10K pull-down The Real Time Clock (RTC) is enabled. (Default: Enable).
ADDR4 10K pull-down The BIOS is located on the SDRAM bus. (Default: BIOS
on SDRAM bus).
ADDR6 10K pull-down Multiplexed pins are used for the memory ECC function;
the COM2 port is disabled. (Default: ECC).
ADDR7 10K pull-down General-purpose I/O pins are used for the serial port,
COM1 function. (Default = COM1).
ADDR8 10K pull-down The I/O queue depth is set to 8. (Default: 8).
ADDR10 10K pull-down SB frequency, only 133 MHz PSB is supported (Default:
set to 133MHz).
ADDR11 10K pull-down PSB frequency, only 133 MHz FSB is supported.