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SA-1100 Developer’s Manual 11-167
Peripheral Control Module
The following table shows the bit locations corresponding to the status and flag bits within the
MCP status register. MCSR contains a collection of read/write, read-only, interruptible, and
noninterruptible bits (refer to the bit descriptions above). Writes to read-only bits have no effect.
The user must clear set status bits before enabling the MCP. Note that writes to reserved bits are
ignored and reads return zeros; question marks indicate that the values are unknown at reset.
Address: 0h 8006 0018 MCP Status Register: MCSR
Read/Write &
Read-Only
Bit 31302928272625242322212019181716
Reserved
Reset0000000000000000
Bit1514131211109876543210
TCE ACE CRC CWC TNE TNF ANE ANF TRO TTU ARO ATU TRS TTS ARS ATS
Reset00000101????0000
Bit Name Description
0 ATS Audio transmit FIFO service request flag (read-only).
0 – Audio transmit FIFO is more than half-full (five or more entries filled) or MCP
disabled.
1 – Audio transmit FIFO is half-full or less (four or fewer entries filled) and MCP
operation is enabled, DMA service request signalled, interrupt request signalled if not
masked (if ATE=1).
1ARS
Audio receive FIFO service request (read-only).
0 – Audio receive FIFO is less than half-full (three or fewer entries filled) or MCP
disabled.
1 – Audio receive FIFO is half-full or more (four or more entries filled) and MCP
operation is enabled, DMA service request signalled, interrupt request signalled if not
masked (if ARE=1).
2 TTS Telecom transmit FIFO service request flag (read-only).
0 – Telecom transmit FIFO is more than half-full (five or more entries filled) or MCP
disabled.
1 – Telecom transmit FIFO is half-full or less (four or fewer entries filled) and MCP
operation is enabled, DMA service request signalled, interrupt request signalled if not
masked (if TTE=1).
3TRS
Telecom receive FIFO service request (read-only).
0 – Telecom receive FIFO is less than half full (three or fewer entries filled) or MCP
disabled.
1 – Telecom receive FIFO is half full or more (four or more entries filled) and MCP
operation is enabled, DMA service request signalled, interrupt request signalled if not
masked (if TRE=1).
4ATU
Audio transmit FIFO underrun.
0 – Audio transmit FIFO has not experienced an underrun.
1 – Audio transmit logic attempted to fetch data from transmit FIFO while it was empty
request interrupt.
5ARO
Audio receive FIFO overrun.
0 – Audio receive FIFO has not experienced an overrun.
1 – Audio receive logic attempted to place data into receive FIFO while it was full,
request
interrupt.