LM3S2793 Datasheet, PDF (514/1194 Pages) Texas Instruments – Stellaris® LM3S2793 Microcontroller

External Peripheral Interface (EPI)
Bit/Field
31:24
23
22
21
20
19:16
Name
reserved
XFFEN
XFEEN
WRHIGH
RDHIGH
reserved
Type
RO
R/W
R/W
R/W
R/W
RO
Reset
0x00
0
Description
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
External FIFO FULL Enable
Value Description
0 No effect.
1 An external FIFO full signal can be used to control write cycles.
If this bit is set and the FFULL signal is high, XFIFO writes are
stalled.
0
External FIFO EMPTY Enable
Value Description
1 An external FIFO empty signal can be used to control read
cycles. If this bit is set and the FEMPTY signal is high, XFIFO
reads are stalled.
0 No effect.
0
WRITE Strobe Polarity
Value Description
0 The WRITE strobe is WRn (active Low).
1 The WRITE strobe is WR (active High).
If both CS0n and CS1n are enabled (the CSCFG field in the
EPIHB16CFG2 register is 0x2 or 0x3 and the CSCFGEXT bit is 0), the
programmed write strobe polarity is used for both CS0n and CS1n
accesses.
0
READ Strobe Polarity
Value Description
0 The READ strobe is RDn (active Low).
1 The READ strobe is RD (active High).
If both CS0n and CS1n are enabled (the CSCFG field in the
EPIHB16CFG2 register is 0x2 or 0x3), the programmed read strobe
polarity is used for both CS0n and CS1n accesses.
0x0
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
514
January 20, 2012
Texas Instruments-Production Data