r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 910

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

Section 23 Gigabit Ethernet Controller (GETHER)
23.3.32 Relay FIFO Size Select Register (TSU_FCM)
TSU_FCM selects the size of the relay FIFO in the TSU, used for relay operations between the E-
MAC-0 and E-MAC-1.
Rev. 1.00 Oct. 01, 2007 Page 844 of 1956
REJ09B0256-0100
Bit
31 to 3
2 to 0
Initial value:
Initial value:
R/W:
R/W:
Bit:
Bit:
Bit Name

FCM[2:0]
31
15


R
R
0
0
30
14


R
R
0
0
29
13


R
R
0
0
Initial
Value
All 0
All 0
28
12


R
R
0
0
27
11
R/W
R
R/W


R
R
0
0
26
10

R

R
0
0
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
Relay FIFO Size
H'0: Port 0 to 1: 3 Kbytes
H'1: Port 0 to 1: 4 Kbytes
H'2: Port 0 to 1: 5 Kbytes
H'3: Port 0 to 1: 6 Kbytes
H'4: Port 0 to 1: Not used
H'5: Port 0 to 1: 1 Kbyte
H'6: Port 0 to 1: 2 Kbytes
H'7: Setting prohibited
This register must not be written to once after relay
operations have been enabled (after the FWEN0 bit in
TSU_FWEN0 or the FWEN1 bit in TSU_FWEN1 is set
to 1).
When data equal to or greater than the specified size of
64 bytes is stored in the relay FIFO, an overflow is
detected and the frame being transferred is discarded.
25


R
R
0
9
0
24


R
R
0
8
0
23


R
R
0
7
0
22


R
R
0
6
0
21

R

R
0
5
0
Port 1 to 0: 3 Kbytes
Port 1 to 0: 2 Kbytes
Port 1 to 0: 1 Kbyte
Port 1 to 0: Not used
Port 1 to 0: 6 Kbytes
Port 1 to 0: 5 Kbytes
Port 1 to 0: 4 Kbytes
20

R

R
0
4
0
19


R
R
0
3
0
R/W
18

R
0
2
0
FCM[2:0]
17

R
0
1
0
R/W
16

R
0
0
0