MSC8113 Reference Manual, Rev. 0
12-38
Freescale Semiconductor
Memory Controller
When ORx[TRLX] and ORx[CSNT] are set in a write-memory access, the strobe lines,
PWE[0–7]
are deasserted one clock earlier than in the normal case. If ORx[ACS]
≠
00,
CS
is also deasserted
one clock earlier, as shown in Figure 12-38 and Figure 12-39. When a bank is selected to
operate with external transfer acknowledge (ORx[SETA] = 1 and ORx[TRLX] = 1), the memory
controller does not support external devices that provide
PSDVAL
to complete the transfer with
zero wait states. The minimum access duration in this case is three clock cycles.
12.3.1.4 Output Enable (POE) Timing
The timing of the
POE
is affected only by TRLX. It always asserts and deasserts on the rising
edge of the external bus clock.
POE
always asserts on the rising clock edge after
CS
is asserted,
and therefore its assertion can be delayed (along with the assertion of
CS
) by programming
ORx[TRLX] = 1.
POE
deasserts on the rising clock edge coinciding with or immediately after
CS
deassertion.
12.3.1.5 Programmable Wait State Configuration
The GPCM supports internal
PSDVAL
generation. It allows fast accesses to external memory
through an internal 60x-compatible bus master or a maximum 17-clock access by programming
ORx[SCY]. The internal
PSDVAL
generation mode is enabled if ORx[SETA] = 0. If
PGTA
is
asserted externally at least two clock cycles before the wait state counter expires, the current
memory cycle is terminated. When ORx[TRLX] = 1, the number of wait states inserted by the
memory controller is defined by 2
×
SCY or a maximum of 30 wait states.
Figure 12-37. GPCM Relaxed-Timing Write (ACS = 1x, SCY = 0, CSNT = 0,TRLX = 1)
Clock
Address
PSDVAL
CSx
BCTL0
PWE
POE
Data
ACS = 10
ACS = 11
Содержание MSC8113
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Страница 300: ...MSC8113 Reference Manual Rev 0 9 40 Freescale Semiconductor Extended Core ...
Страница 304: ...MSC8113 Reference Manual Rev 0 10 4 Freescale Semiconductor MQBus and M2 Memory ...
Страница 308: ...MSC8113 Reference Manual Rev 0 11 4 Freescale Semiconductor SQBus ...
Страница 544: ...MSC8113 Reference Manual Rev 0 16 46 Freescale Semiconductor Direct Memory Access DMA Controller ...
Страница 590: ...MSC8113 Reference Manual Rev 0 17 46 Freescale Semiconductor Interrupt Processing ...
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Страница 622: ...MSC8113 Reference Manual Rev 0 19 8 Freescale Semiconductor Internal Peripheral Bus IPBus ...
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