CHAPTER 22:Media Local Bus Interface (MediaLB)
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
829
Note:
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A system interrupt is triggered when a system command, locking or unlocking is detected, as
shown inTable 2-4. An interrupt flag is changed to "1" when an interrupt cause is detected. Each
interrupt flag has a corresponding interrupt mask bit. Setting an interrupt mask to "1" enables
masking.
Table 2-4 Interrupt Flags and Interrupt Cause Factors for System Interrupts
Interrupt Source
Register
Interrupt Flag
Interrupt Mask
Interrupt Flag Clear
Detecting a reset (MlbRset(FEH))
MLBn_SSCR
SDR
MLBn_SMCR:SMR
Writing "1" to SDR
Detecting a network lock (MOST_Lock(F0H))
SDNL
MLBn_SMCR:SMNL
Writing "1" to SDNL
Detecting a network unlock (MOST_Unlock(E2H))
SDNU
MLBn_SMCR:SMNU
Writing "1" to SDNU
Detecting a channel scan (MlbScan(E4H))
SDCS
MLBn_SMCR:SMCS
Writing "1" to SDCS
Detecting a sub-command (MlbSubCmd(E6H))
SDSC
MLBn_SMCR:SMSC
Writing "1" to SDSC
Detecting a MediaLB lock
SDML
MLBn_SMCR:SMML
Writing "1" to SDML
Detecting a MediaLB unlock
SDMU
MLBn_SMCR:SMMU
Writing "1" to SDMU
Loop Back Mode
To facilitate debugging of transmission paths, MediaLB supports the loop back test mode.
Setting the LBM bit in Device Control Configuration Register (MLBn_DCCR) to "1" causes data to be
received via Channel 0 and transmitted back via Channel 1.To use the loop back test mode, use the
following steps to set the mode*:
1. Set the logical channel addresses for Channels 0 and 1. (Same address cannot be used for
different channels.)
2. Set Channel 0 to any channel type. Enable "Receipt" and set "Enable channel".
3. Set Channel 1 to the same channel type as that of Channel 0, enable "Transmit" and set "Enable
channel".
4. Set the loop back mode bit (MLBn_DCCR:LBM="1").
Note:
−
*During the loop back mode, a protocol error or a break is prohibited for both Channels 0 and 1.
During the loop back mode, the Next Buffer Ready bits for Channels 0 and 1 remains cleared
(MLBn_CSCR0:RDY=MLBn_CSCR1:RDY="0"). During the loop back mode, little-endian mode
must be disabled (MLBn_DCCR=MLE="0"). During the loop back mode, ishochronous packet
lengths must be quadlet multiples.
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