51
Control Registers
3
Board Ready Register (BRR)
The Board Ready Register (BRR) tells the user when the board is able to be accessed from
the VMEbus for read/write operations following a reset condition.
Powerup/Reset Default = $0000
Board Ready Register Bit Definitions
Bits 15 through 00:
BR [15..0] -
This code indicates the response of the local DSP after
a reset condition has been processed and is interpreted as shown
in Table 3-4 below:
NOTE:
1
The board is performing either self-test, calibration, or configuration of channels.
The board is not available for VMEbus accesses.
2
The onboard RAM has failed the RAM
test. The DSP has stopped processing the reset condition. Replace RAM or check to see
that it is properly installed.
3
One or more ADCs has failed initial self-test. Refer to the
Channel Pass/Fail Register to determine the status of each ADC. The board will function
with the failed channel(s) but the data for the channel(s) will not be correct.
4
Minimum
number of calibration voltages is three. An attempt to calibrate with fewer than three
calibration voltages occurred. Either enter more calibration voltages or terminate
calibration process.
5
Maximum number of calibration voltages is seven. An attempt to
calibrate with more than seven calibration voltages occurred. After entering the maximum
number of calibration voltages, the
CAL Done
bit must be set in the BCR to inform the DSP
to calculate the coefficients.
Table 3-3 Board Ready Register’s Bit Map
Board Ready Register (Offset $0002) Read Only, Byte/Word
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 09
Bit 08
BR15
BR14
BR13
BR12
BR11
BR10
BR9
BR8
Bit 07
Bit 06
Bit 05
Bit 04
Bit 03
Bit 02
Bit 01
Bit 00
BR7
BR6
BR5
BR4
BR3
BR2
BR1
BR0
Table 3-4 Board Ready Register’s Bit Definitions (BR[15..0])
BR[15..0]
Function
Notes
$0000
Null (Self-Test/Calibration/Configuration not active)
$3B00/$3B01
Self-Test/Calibration/Configuration is active
1
$0001
RAM Self-Test has failed
2
$0002
ADC has failed self-test
3
$0003
Not enough calibration points entered
4
$0004
Attempted to enter more than seven (7) calibration voltages
5
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