ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 328

• Manufacturer Part Number: ez80f91
• Description: Ez80 Acclaimplus!? Connectivity Assp Ez80f91 Assp
• Manufacturer: ZiLOG Semiconductor

Table 202. EMAC PHY Unit Select Address Register
Table 203. EMAC Transmit Polling Timer Register (EMAC_PTMR = 0040h)
PS027001-0707
Bit
Reset
CPU Access
Note: R = Read Only; R/W = Read/Write.
Bit
Position
[7:5]
[4:0]
FIAD
Bit
Reset
CPU Access
Note: R/W = Read/Write.
Bit
Position
[7:0]
EMAC_PTMR
EMAC PHY Unit Select Address Register
The EMAC PHY Unit Select Address Register allows the selection of multiple connected
external PHY devices. See
EMAC Transmit Polling Timer Register
This register sets the Transmit Polling Period in increments of TPTMR = SYSCLK ÷ 256.
Whenever this register is written, the status of the Transmit Buffer Descriptor is checked
to determine if the EMAC owns the Transmit buffer. It then rechecks this status every
TPTMR (calculated by TPTMR x EMAC_PTMR[7:0]). The Transmit Polling Timer is
disabled if this register is set to
transmission is in progress when EMAC_PTMR is set to
plete. See
Value
000
00h–1Fh Programmable 5-bit value that selects an external PHY.
Value
00h–FFh The Transmit polling period.
R/W
Table
Reserved.
Description
R
7
0
7
0
Description
203.
R/W
R
6
0
6
0
R/W
Table
R
5
0
5
0
00h
202.
R/W
R/W
4
0
4
0
(which also disables the transmitting of packets). If a
R/W
R/W
3
0
3
0
(EMAC_FIAD = 003Fh)
R/W
R/W
2
0
2
0
00h
R/W
R/W
Ethernet Media Access Controller
1
0
1
0
, the transmission will com-
Product Specification
R/W
R/W
0
0
0
0
eZ80F91 ASSP
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