GR712RC-UM, Jun 2017, Version 2.9 71 www.cobham.com/gaisler
GR712RC
6.3 Registers
The on-chip RAM is configured through a configuration register mapped at address 0x80100000:
Table 35. FTAHBRAM registers
APB Address offset Register
0x80100000 Configuration Register
Table 36. Configuration Register
31 30 29 24 23 21 20 13 12 10 9 8 7 6 0
DIAG MEMSIZE SEC MEMSIZE WB RB EN TCB
31: 30 RAM timing adjust. Must be written with “00”.
23 21 3 MSB bits of log2 of the memory size (read-only). Hardcoded to “001”.
20: 13 Single error counter (SEC): Incremented each time a single error is corrected (includes errors on
checkbits). Each bit can be set to zero by writing a one to it.
12: 10 3 LSB bits of log2 of the memory size (read-only). Hardcoded to “000”.
9 Write Bypass (WB): When set, the TCB field is stored as check bits when a write is performed to the
memory.
8 Read Bypass (RB): When set during a read or subword write, the check bits loaded from memory are
stored in the TCB field.
7 EDAC Enable (EN): When set, the EDAC is used otherwise it is bypassed during read and write
operations.
6: 0 Test Check Bits (TCB): Used as checkbits when the WB bit is set during writes and loaded with the
check bits during a read operation when the RB bit is set.
Any unused most significant bits are reserved. Always read as ‘000...0’.
All fields except TCB are initialized to 0 at reset.
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