tmpr4937 TOSHIBA Semiconductor CORPORATION, tmpr4937 Datasheet - Page 116
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tmpr4937
Manufacturer Part Number
tmpr4937
Description
64-bit Tx System Risc
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMPR4937.pdf
(552 pages)
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ACK*/READY (Input)
SWE*/BWE*
ADDR [19:0]
DATA [31:0]
7.3.7.4
ACK*/READY (Input)
SYSCLK
CE*
ADDR [19:0]
DATA [31:0]
ACK* Input Timing (External ACK Mode)
acknowledged (Figure 7.3.9 ACK* Input Timing (Single Read Cycle)). During a Write cycle,
assertion of the ACK* signal is acknowledged, SWE*/BWE* is deasserted three clock cycles
later, then data is held for one clock cycle after that (Figure 7.3.10 ACK* Input Timing (Single
Write Cycle).
ACK* cannot be acknowledged consecutively on consecutive clock cycles. External devices can
assert ACK* across multiple clock cycles under the following conditions.
•
•
SYSCLK
The ACK* signal becomes an input signal when in the external ACK mode.
During a Read cycle, data is latched two clock cycles after assertion of the ACK* signal is
The ACK* input signal is internally synchronized. Due to internal State Machine restrictions,
OE*
CE*
During Single access, the ACK* signal can be asserted before the end of the cycle during
which CE* is dasserted.
During Burst access, it is possible to assert the ACK* signal for up to three clock cycles
during Reads and for up to five clock cycles during Writes. If the ACK* signal is asserted for
a period longer than this, it will be acknowledged as the next valid ACK* signal.
Figure 7.3.10 ACK* Input Timing (Single Write Cycle)
Figure 7.3.9 ACK* Input Timing (Single Read Cycle)
Acknowledge ACK*
7-16
Acknowledge ACK*
Chapter 7 External Bus Controller
3 clocks
2 clocks
4 clocks
Latch Data
EBCCRn.SHWT=0
EBCCRn.SHWT=0
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