HARDWARE
2.8PERIPHERAL BUS
The CPCI-824 utilizes the 440GX External Bus Controller (EBC) as a data communication path to the Flash memory and other peripheral devices such as LEDs and the CPLD for the external register control. The address/data path is on a programmable 8-bit width bus and operates at high bandwidth.
2.8.1Flash ROM
The CPCI-824 provides 8 Mbytes of sector-programmable Flash ROM for non-volatile code storage. The CPCI-824 Flash ROM is an Intel Strataflash J3 type-device, 8 (28F640J3) MBytes in size. The width of the flash bus is 8 bits.
On the CPCI-824, the Flash ROM is mapped beginning at address FF80 0000h, and is divided into four separate memory regions by Breeze firmware: boot region, flash file system, free flash, and boot parameter region. The mapping ensures that, after a reset, the processor can begin execution at the reset, the processor can begin execution at the reset vector address FFFF FFFCh. The size and start location of each of these regions is defined by Breeze software. Refer to the Breeze for 440GX Developer’s Manual for more information.
2.8.2LEDS
The CPCI-824 front panel has four green LEDs. The four green LEDs labeled IOP, ACT, STAT0, and STAT1 are under software control. The LEDs are controlled by a write-only register which is located at address E000 0001H. The LED Register bitmap is shown in Figure 2-2. A given LED is turned ON by writing a “1” to the appropriate bit in the LED register.
Figure 2-2. LED Register Bitmap, E800 0001H | |
STAT0 | | | | | | | |
Activity | | | | | | | |
IOP | | | | | | | |
STA1 | | | | | | | |
(write only) | | | | | | | |
(1) LED on | | | | | | | |
(0) LED off | | | | | | | |
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
Reserved | | | | | | | |
2.8.3User LEDs During Initialization
Breeze indicates the progress of its hardware initialization on the user LEDS. In the event that initial- ization should fail for some reason, the number of lit LEDs can be used to determine the cause of failure. Table 2-6 lists the tests that correspond to each LED.
CPCI-824 User’s Manual | 2-7 |
Revision 1.0, January 2006
