EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 299

• Manufacturer Part Number: EZ80F91MCU
• Description: eZ80Acclaim-TM Flash Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

PS019209-0504
EMAC Receive Write Pointer Register—Low Byte
The Read Only Receive-Write-Pointer register reports the current RxDMA
Receive Write pointer. This pointer gets initialized to EmacTLBP whenever
Emac_RST bits SRST or HRRTN are set. Because the size of the packet is lim-
ited to a minimum of 32 bytes, the last five bits are always zero. See Tables 176
and 177.
Table 176. EMAC Receive Write Pointer Register—Low Byte
(EMAC_RWP_L = 0051h)
5
NVALID
[4:0]
RDADR
Bit
Reset
CPU Access
Note: R = Read Only.
Bit
Position
[7:0]
EMAC_RWP_L
1
0
00h–
1Fh
Value
00h–
E0h
MII Scan result is not valid Emac_PRSD is invalid
Denotes PHY addressed in current scan cycle.
Emac_PRSD is valid.
P R E L I M I N A R Y
R
7
0
Description
These bits represent the Low byte of the 2-byte EMAC
RxDMA Receive Write Pointer value, {EMAC_RWP_H,
EMAC_RWP_L}. Bit 7 is bit 7 of the 16-bit value. Bit 0 is bit
0 (lsb) of the 16-bit value.
R
6
0
R
5
0
R
4
0
Ethernet Media Access Controller
R
3
0
Product Specification
R
2
0
eZ80F91 MCU
R
1
0
R
0
0
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