ON-LINE CONFIGURATION
OPERATION
I-E96-211A
A - 7
Primary
Backup
n
n+1
01xx0x0x 11xx1x0x
{
5
z
5
8. The backup MFC requests the primary MFC to shutdown
and assume the role of a hot backup. The backup MFC waits to
act as the primary MFC. (A hot backup is a backup which
remains on-line and ready to assume control if an error is
detected in the new configuration).
Primary
Backup
n
n+1
01xx0x0x 01xx1x0x
{
5
z
5
9. The primary MFC has removed the bus clock (BUSCLK)
and acts as a hot backup. The reconfigured backup MFC is
now serving as the primary MFC.
To return to Step 5, stop and reset the backup MFC. This
allows the user to correct a bad configuration.
10. Resetting the primary MFC, currently acting as the hot
backup, tells it to get a copy of the new configuration. The pri-
mary MFC must be stopped and reset at this point in order for
the cycle to complete.
Primary
Backup
n
n+1
10xx0x0x 00xx0x0x
{
z
z
z
11. After the backup MFC copies the new configuration into the
primary MFC, this cycle is complete. The backup MFC is now
serving as the primary MFC while the primary handles the
backup role. (Notice that the LED combination is the opposite
of Step 1 indicating the role reversal).
Primary Cycle
The step numbers in this cycle correspond to the states of Fig-
ure
. The state of the LEDs and the contents of the second
module status byte are indicated in the left margin.
Primary
Backup
n
n+1
01xx0x0x 10xx1x0x
z
{
z
5
1. The primary MFC is actively controlling the process. (This
represents the same juncture as Step 5 of the backup cycle).
