參數(shù)資料
型號： M38K09F8LFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP64
封裝： 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù)： 102/133頁
文件大小： 1359K
代理商： M38K09F8LFP
38K0 Group
Rev.3.00
Oct 05, 2006
page 70 of 129
REJ03B0192-0300
MULTICHANNEL RAM
The 38K0 group has the built-in multichannel RAM including the
small logic circuit (RAM I/F) instead of ordinary RAM.
The multichannel RAM has the USB channel and the EXB channel
in addition to the CPU channel.
The multichannel RAM controls access from CPU, USB and EXB,
synchronizing control with
φ. The USB transfer rate is about 1.5
Mbytes/second. Access to the multichannel RAM is performed at
every about 5.3 clocks in
φ = 8 MHz, or at every about 4 clocks in
φ = 6 MHz. The USB’s access has priority to the EXB’s.
The one wait function (ONW function) of 38000 series CPU is
used internally to control access with the CPU. When receiving an
access request from the USB or the EXB, the multichannel RAM
outputs ONW signal to wait the CPU for one clock, and access of
the USB or the EXB is performed.
If the multichannel RAM is outputting ONW signal while the CPU
is in the state of reading/writing for the RAM area, the CPU read
cycle or write cycle is extended by 1 period of
φ.
Fig. 99 Multichannel RAM timing diagram (no wait)
φ
CPU AD
RD/WR
USB REQ
EXB REQ
ONW
RAM access right
RAM RD/WR
CPU bus cycle
Multichannel RAM
RAM bus cycle
CPU
USB
CPU
RAM area
Except RAM
RAM area
No wait
Except RAM
No RD/WR
φ
CPU AD
RD/WR
USB REQ
EXB REQ
ONW
RAM access right
RAM RD/WR
One wait
2-cycle wait (max.) for EXB
Prior CPU
Prior USB
RAM area
One wait
USB having priority of USB/EXB
simultaneous access
Prior CPU
RAM area
CPU
EXB
CPU
USB
RAM area
EXB
Multichannel RAM
RAM bus cycle
CPU bus cycle
One wait
Prohibiting continuous access of
USB/EXB
CPU accessing RAM at the latter part
One wait
RAM area
Fig. 100 Multichannel RAM timing diagram (one wait)
ONW = “H”
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相關代理商/技術參數(shù)
參數(shù)描述
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