CHAPTER 3 FUNCTIONAL OUTLINE
PRELIMINARY
NEC confidential and Proprietary
88
(b) Receive
The
µ
PD98413 can switch the receive port from working port to protection port. The method is as follows.
1. Set the same receive port address to the UADR bit of working port and protection port of the PTADRR
register. (In the POS mode, set the same in-band address to the IADR bit of Port0 and Port1 of the
PTADRR register.)
2. Stop the receive FIFO of the protection port by the PnFCLS bit of the MDAPIR register. And enable the
protection port by setting the PnER bit of the PENB register.
3. Disable the working Port by setting the PnER bit of the PENB register.
4. After confirm that the working port FIFO is not busy by the PnBSY bit of the DGE and TGE register, start
the receive FIFO of the protection port by the PnFCLS bit of the MDAPIR register.
UTOPIA/POS-PHY
Interface
(Port3)
(Port2)
protection
port
(Port1)
working port
(Port 0)
Port2
Receive
FIFO
Port3
Receive
FIFO
same port address
(setting by the UADR bit of the PTADRR register)
Port0
Receive
FIFO
Port1
Receive
FIFO
Содержание NEASCOT-P65
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