LM3S1621 Datasheet, PDF (477/947 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Stellaris^® LM3S1621 Microcontroller
Table 10-7. EPI General Purpose Signal Connections (continued)
EPI Signal
General-Purpose General- Purpose General- Purpose General- Purpose
Signal (D8, A20) Signal (D16, A12) Signal (D24, A4)
Signal (D32)
EPI0S3
D3
D3
D3
D3
EPI0S4
D4
D4
D4
D4
EPI0S5
D5
D5
D5
D5
EPI0S6
D6
D6
D6
D6
EPI0S7
D7
D7
D7
D7
EPI0S8
A0
D8
D8
D8
EPI0S9
A1
D9
D9
D9
EPI0S10
A2
D10
D10
D10
EPI0S11
A3
D11
D11
D11
EPI0S12
A4
D12
D12
D12
EPI0S13
A5
D13
D13
D13
EPI0S14
A6
D14
D14
D14
EPI0S15
EPI0S16
A7
D15
D15
D15
A8
A0^a
D16
D16
EPI0S17
A9
A1
D17
D17
EPI0S18
A10
A2
D18
D18
EPI0S19
A11
A3
D19
D19
EPI0S20
A12
A4
D20
D20
EPI0S21
A13
A5
D21
D21
EPI0S22
A14
A6
D22
D22
EPI0S23
EPI0S24
A15
A7
D23
D23
A16
A8
A0^b
D24
EPI0S25
A17
A9
A1
D25
EPI0S26
EPI0S27
A18
A10
A2
D26
A19/iRDY^c
A11/iRDY^c
A3/iRDY^c
D27
EPI0S28
WR
WR
WR
D28
EPI0S29
RD
RD
RD
D29
EPI0S30
Frame
Frame
Frame
D30
EPI0S31
Clock
Clock
Clock
D31
a. In this mode, half-word accesses are used. AO is the LSB of the address and is equivalent to the system A1 address.
b. In this mode, word accesses are used. AO is the LSB of the address and is equivalent to the system A2 address.
c. This signal is iRDY if the RDYEN bit in the EPIGPCFG register is set.
10.4.3.1
Bus Operation
A basic access is 1 EPI clock for write cycles and 2 EPI clocks for read cycles. An additional EPI
clock can be inserted into a write cycle by setting the WR2CYC bit in the EPIGPCFG register. Note
that the RD2CYC bit must always be set in the EPIGPCFG register.
January 21, 2012
477
Texas Instruments-Production Data