CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER)
User’s Manual U12688EJ4V0UM00
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(11) T2F state
The T2F state corresponds to the middle state of a flyby transfer from internal peripheral I/O to internal RAM.
The write cycle to internal RAM is started. After entering the T2F state, the bus invariably enters the T3F
state.
(12) T3F state
The T3F state corresponds to the last state of a flyby transfer from internal peripheral I/O to internal RAM, or
a wait state. In the last T3F state, the write strobe signal is made inactive.
(13) T1FR state
The bus enters the T1FR state at the beginning of a flyby transfer from internal RAM to internal peripheral I/O.
The read cycle from internal RAM is started. After entering the T1FR state, the bus invariably enters the
T2FR state.
(14) T2FR state
The T2FR state corresponds to the middle state of a flyby transfer from internal RAM to internal peripheral
I/O. The write cycle to internal peripheral I/O is started. After entering the T2FR state, the bus invariably
enters the T3FR state.
(15) T3FR state
T3FR is a state in which it is judged whether a flyby transfer from internal RAM to internal peripheral I/O is
continued or not. If the next transfer is executed in block transfer mode, the bus enters the T1FRB state after
the T3FR state, otherwise, the bus enters the T4 state.
(16) T1FRB state
The bus enters the T1FRB state at the beginning of a flyby block transfer from internal RAM to internal
peripheral I/O. The read cycle from internal RAM is started.
(17) T1FRBI state
The T1FRBI state corresponds to a wait state of a flyby block transfer from internal RAM to internal peripheral
I/O.
A wait state requested by peripheral hardware is generated, and the bus enters the T2FRB state.
(18) T2FRB state
The T2FRB state corresponds to the middle state of a flyby block transfer from internal RAM to internal
peripheral I/O. The write cycle to internal peripheral I/O is started. After entering the T2FRB state, the bus
invariably enters the T3FRB state.
(19) T3FRB state
T3FRB is a state in which it is judged whether a flyby transfer from internal RAM to internal peripheral I/O is
continued or not. If the next transfer is executed in block transfer mode, the bus enters the T1FRB state after
the T3FRB state, otherwise, the bus enters the T4 state.
(20) T4 state
The T4 state corresponds to a wait state of a flyby transfer from internal RAM to internal peripheral I/O. A
wait state requested by peripheral hardware is generated, and the bus enters the T3 state.
Содержание V850E/MS1 UPD703100
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