LM3S9B81 Datasheet, PDF (363/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

Stellaris® LM3S9B81 Microcontroller
Table 10-4. Capabilities of Host Bus 8 and Host Bus 16 Modes (continued)
Host Bus Type
MODE
CSCFG
Max # of
External
Devices
BSEL
Byte Access Available Address
HB16
0x1
0x2
2
1
Yes
HB16
0x1
0x3
2
0
No
9 bits
10 bits^a
HB16
0x1
0x3
2
1
Yes
8 bits
HB16
0x3
0x1
1
0
No
none
HB16
0x3
0x1
1
1
Yes
none
HB16
0x3
0x3
2
0
No
none
HB16
0x3
0x3
2
1
Yes
none
a. If byte selects are not used, data accesses are on 2-byte boundaries. As a result, the available address space is doubled.
Table 10-5 on page 363 shows how the EPI[31:0] signals function while in Host-Bus 8 mode.
Notice that the signal configuration changes based on the address/data mode selected by the MODE
field in the EPIHB8CFG2 register and on the chip select configuration selected by the CSCFG field
in the same register. Any unused EPI controller signals can be used as GPIOs or another alternate
function.
Table 10-5. EPI Host-Bus 8 Signal Connections
EPI Signal
CSCFG
HB8 Signal (MODE
=ADMUX)
EPI0S0
X^a
AD0
EPI0S1
X
AD1
EPI0S2
X
AD2
EPI0S3
X
AD3
EPI0S4
X
AD4
EPI0S5
X
AD5
EPI0S6
X
AD6
EPI0S7
X
AD7
EPI0S8
X
A8
EPI0S9
X
A9
EPI0S10
X
A10
EPI0S11
X
A11
EPI0S12
X
A12
EPI0S13
X
A13
EPI0S14
X
A14
EPI0S15
X
A15
EPI0S16
X
A16
EPI0S17
X
A17
EPI0S18
X
A18
EPI0S19
X
A19
EPI0S20
X
A20
EPI0S21
X
A21
EPI0S22
X
A22
HB8 Signal (MODE
=ADNOMUX (Cont.
Read))
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
HB8 Signal (MODE
=XFIFO)
D0
D1
D2
D3
D4
D5
D6
D7
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
June 29, 2010
363
Texas Instruments-Advance Information