Media Local Bus (MLB)
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor 27-11
27.3.2.3 System Data Configuration Register (SDCR)
The System Data Configuration Register (SDCR) allows system software to receive control information
from the MLB Controller. SDCR is updated once per frame by hardware during the MLB System Channel.
System software must read SDCR before the start of the next MLB frame to prevent the current frame data
from being lost.
SDML System Detects MLB Lock. This bit is set to indicate that the MLB Device has locked to the MLB frame. Detecting a
MLB lock generates a maskable system interrupt to system software. Once set, this bit is sticky until cleared by
software.
0 MLB device has not locked to MLB frame.
1 MLB device has locked to MLB frame.
SDSC System Detects SubCommand. This bit is set to indicate that the MLB Device has received the MlbSubCmd (E6h)
System Command. The user-defined software command is stored in the SDCR register. The decoding of this
command is left up to software. Detecting MlbSubCmd generates a maskable system interrupt to system software.
Once set, this bit is sticky until cleared by software.
0 MLB device has not detected a Sub-command System Command.
1 MLB device has detected a Sub-command System Command.
SDCS System Detects Channel Scan. This bit is set to indicate that the MLB Device has received the MlbScan (E4h)
System Command. The target DeviceAddress is stored in the SDCR register. Detecting MlbScan generates a
maskable system interrupt to system software. Once set, this bit is sticky until cleared by software.
0 MLB device has not detected a System Scan Command.
1 MLB device has detected a System Scan Command.
SDNU System Detects Network Unlock. This bit is set to indicate that the MLB Device has received the MOST_Unlock (E2h)
System Command. Detecting MOST_Unlock generates a maskable system interrupt to system software. Once set,
this bit is sticky until cleared by software.
0 MLB device has not detected an Unlock Command.
1 MLB device has detected an Unlock Command.
SDNL System Detects Network Lock. This bit is set to indicate that the MLB Device has received the MOST_Lock (E0h)
System Command. Detecting MOST_Lock generates a maskable system interrupt to system software. Once set,
this bit is sticky until cleared by software.
0 MLB device has not detected a Lock Command.
1 MLB device has detected a Lock Command.
SDR System Detects Reset. This bit is set to indicate that the MLB Device has received the MlbReset (FEh) System
Command. The target DeviceAddress is stored in the SDCR register. Detecting MLBReset generates a maskable
system interrupt to system software. Once set, this bit is sticky until cleared by software.
0 MLB device has not detected a Reset Command.
1 MLB device has detected a Reset Command.
Table 27-9. SSCR Field Descriptions (continued)
Field Description
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