TM4C129XNCZAD Datasheet, PDF (881/2191 Pages) Texas Instruments – Tiva Microcontroller

Tiva^™ TM4C129XNCZAD Microcontroller
Each wait state adds 2 EPI clock cycles to the duration of the WRn or RDn strobe. During idle cycles,
the address and muxed address data signals maintain the state of the last cycle.
Figure 11-12 on page 881 shows a basic Host-Bus read cycle. Figure 11-13 on page 881 shows a
basic Host-Bus write cycle. Both of these figures show address and data signals in the
non-multiplexed mode (MODE field ix 0x1 in the EPIHBnCFG register).
Figure 11-12. Host-Bus Read Cycle, MODE = 0x1, WRHIGH = 0, RDHIGH = 0
ALE
(EPI0S30)
CSn
(EPI0S30)
WRn
(EPI0S29)
RDn/OEn
(EPI0S28)
BSEL0n/
BSEL1n^a
Address
Data
a _{BSEL0n and BSEL1n are available in Host-Bus 16 mode only.}
Data
Figure 11-13. Host-Bus Write Cycle, MODE = 0x1, WRHIGH = 0, RDHIGH = 0
ALE
(EPI0S30)
CSn
(EPI0S30)
WRn
(EPI0S29)
RDn/OEn
(EPI0S28)
BSEL0n/
BSEL1n^a
Address
Data
a _{BSEL0n and BSEL1n are available in Host-Bus 16 mode only.}
Data
Figure 11-14 on page 882 shows a write cycle with the address and data signals multiplexed (MODE
field is 0x0 in the EPIHBnCFG register). A read cycle would look similar, with the RDn strobe being
asserted along with CSn and data being latched on the rising edge of RDn.
June 18, 2014
881
Texas Instruments-Production Data