CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER)
User’s Manual U12688EJ4V0UM00
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(21) T1FH state
The T1FH state corresponds to the standard state of a flyby transfer between external memory and external
I/O, and is the executing cycle of this transfer. After entering the T1FH state, the bus enters the T2FH state.
(22) T1FHI state
The T1FHI state corresponds to the last state of a flyby transfer between external memory and external I/O,
and is a state in which the bus is waiting for end of DMA flyby transfer. After entering the T1FHI state, the
bus is released, and enters the TE state.
(23) T2FH state
T2FH is a state in which it is judged whether a flyby transfer between external memory and external I/O is
continued or not. If the next transfer is executed in block transfer mode, the bus enters the T1FH state after
the T2FH state, otherwise, when a wait is issued, the bus enters the T1FHI state. When a wait is not issued,
the bus is released, and enters the TE state.
(24) T3 state
The bus enters the T3 state when a DMA transfer has been completed, and the bus has been released. After
entering the T3 state, the bus invariably enters the TE state.
(25) TE state
The TE state corresponds to the output state. In the TE state, the DMAC outputs the DMA transfer end signal
(TCn), and initializes miscellaneous internal signals (n = 0 to 3). After entering the TE state, the bus
invariably enters the TI state.
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