GMS30C7201 Datasheet, PDF (192/352 Pages) Hynix Semiconductor – 60MHz operation frequency Low power consumption

Fast AMBA Peripherals
The receive buffer contains three tag bits (32, 33 and 34) that are not directly readable. The 32nd
bit is set at the top of the buffer whenever the last byte within a frame is moved from the receive
serial shifter to the receive buffer. This tag travels along with the last data value to the buffer.
CRC Error Status (CRE) (read-only)
The CRC error flag (CRE) is set when the CRC value calculated by the receive logic does not
match the CRC value contained within the incoming serial data stream.
Whenever a CRC error is detected, the 33rd bit is set within the top entry of the receive buffer
corresponding to the last byte of data within the frame
Receiver Overrun Status (ROR) (read-only)
The receiver overrun flag (ROR) is set when the receive logic attempts to place data into the
receive buffer after it has been filled.
The 34th bit is set within the top entry of the receive buffer whenever an overrun occurs. This
tag travels along with the last “good” data value before the overflow occurred.
Figure 12-10: bits within MIr status register 1 shows the location of the flag and status bits
within MIr status register 1. The bits within this register do not produce interrupt requests. Note
that the reset value of RTD is unknown and must be cleared if set following a reset of the ARM
7201. The remainder of FIDR is read-only (writes are ignored).
Address: 0h 8001 1084
Bit
7
6
5
ROR CRE EOF
Reset 0
0
0
MISR1
4
3
RTD
0
0
Read/Write &
Read-Only
2
1
0
TBY RSY
0
0
0
Figure 12-10: bits within MIr status register 1
Bit
Name
0
RSY
1
TBY
2
-
3
-
Description
Receiver Synchronized Flag (read-only)
0 - Receiver is in hunt mode or is disabled
1 - Receiver logic is synchronized with the incoming data
Transmitter Busy Flag (read-only)
0 - Transmitter is idle (continuous flags), or disabled, or an abort is being transmitted
1 - Transmit logic is currently transmitting a frame (address, control, data, CRC, or start/stop
flag)
unused
unused
Table 12-31: MIr status register 1
12-38
GMS30C7201 Data Sheet