LM3S9B81 Datasheet, PDF (378/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

External Peripheral Interface (EPI)
Figure 10-22. EPI Clock Operation, CLKGATE=1, WR2CYC=1
Clock
(EPI0S31)
WR
(EPI0S28)
Address
Data
10.5
Register Map
Table 10-8 on page 378 lists the EPI registers. The offset listed is a hexadecimal increment to the
register’s address, relative to the base address of 0x400D.0000. Note that the EPI controller clock
must be enabled before the registers can be programmed (see page 174).
Note:
A back-to-back write followed by a read of the same register reads the value that written
by the first write access, not the value from the second write access. (This situation only
occurs when the processor core attempts this action, the μDMA does not do this.). To read
back what was just written, another instruction must be generated between the write and
read. Read-write does not have this issue, so use of read-write for clear of error interrupt
cause is not affected.
Table 10-8. External Peripheral Interface (EPI) Register Map
Offset Name
Type
Reset
Description
0x000 EPICFG
0x004 EPIBAUD
0x010 EPISDRAMCFG
0x010 EPIHB8CFG
0x010 EPIHB16CFG
0x010 EPIGPCFG
0x014 EPIHB8CFG2
0x014 EPIHB16CFG2
0x014 EPIGPCFG2
0x01C EPIADDRMAP
0x020 EPIRSIZE0
0x024 EPIRADDR0
0x028 EPIRPSTD0
0x030 EPIRSIZE1
0x034 EPIRADDR1
0x038 EPIRPSTD1
R/W
0x0000.0000 EPI Configuration
R/W
0x0000.0000 EPI Main Baud Rate
R/W
0x42EE.0000 EPI SDRAM Configuration
R/W
0x0000.0000 EPI Host-Bus 8 Configuration
R/W
0x0000.0000 EPI Host-Bus 16 Configuration
R/W
0x0000.0000 EPI General-Purpose Configuration
R/W
0x0000.0000 EPI Host-Bus 8 Configuration 2
R/W
0x0000.0000 EPI Host-Bus 16 Configuration 2
R/W
0x0000.0000 EPI General-Purpose Configuration 2
R/W
0x0000.0000 EPI Address Map
R/W
0x0000.0003 EPI Read Size 0
R/W
0x0000.0000 EPI Read Address 0
R/W
0x0000.0000 EPI Non-Blocking Read Data 0
R/W
0x0000.0003 EPI Read Size 1
R/W
0x0000.0000 EPI Read Address 1
R/W
0x0000.0000 EPI Non-Blocking Read Data 1
See
page
380
382
384
386
390
394
399
401
403
404
406
407
408
406
407
408
378
June 29, 2010
Texas Instruments-Advance Information