W5300 datasheet(59/128 Pages) WIZNET

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TMSR(TX Memory Size Register) [R/W] [0x08020/0x020] [08.08.08.08.08.08.08.08]

It configures internal TX memory size of each SOCKET. TX memory size of each SOCKET is

configurable in the range of 0~64Kbytes. 8Kbytes is assigned when reset. Total memory size of

each SOCKET

’s TX memory (TMSSUM) should be the multiple of 8. The sum of TMSSUM and

RMSSUM (Total s

ize of each SOCKET’s RX memory) is 128KBytes.

TMS01R(TX Memory Size of SOCKET0/1 Register) [R/W] [0x08020/0x020] [0x0808]

It configures internal TX memory size.

Ex1) SOCKET0 : 4KB, SOCKET1 : 16KB

TMS01R(0x08020/0x020)

TMSR0(0x08020/0x020)

TMSR1(0x08021/0x021)

4 (0x04)

16 (0x10)

TMS23R(TX Memory Size of SOCKET2/3 Register) [R/W] [0x08022/0x022] [0x0808]

It configures internal TX memory size of SOCKET2 and SOCKET3.

Ex2) SOCKET2 : 1KB, SOCKET3 : 20KB

TMS23R(0x08020/0x020)

TMSR2(0x08022/0x022)

TMSR3(0x08023/0x023)

1 (0x01)

20 (0x14)

TMS45R(TX Memory Size of SOCKET4/5 Register) [R/W] [0x08024/0x024] [0x0808]

It configures internal TX memory size of SOCKET4 and SOCKET5.

Ex3) SOCKET4 : 0KB, SOCKET5 : 7KB

TMS45R(0x08024/0x024)

TMSR4(0x08024/0x024)

TMSR5(0x08025/0x025)

0 (0x00)

7 (0x07)

TMS67R(TX Memory Size of SOCKET6/7 Register) [R/W] [0x08024/0x024] [0x0808]

It configures internal TX memory size of SOCKET6 and SOCKET7.

Ex4) SOCKET6 : 12KB, SOCKET7 : 12KB

TMS67R(0x08026/0x026)

TMSR6(0x08026/0x026)

TMSR7(0x08027/0x027)

12 (0x0C)

As shown in above Ex1) ~ Ex4), TMSSUM(TMSR0 + TMSR1 + TMSR2 + TMSR3 + TMSR4 +

TMSR5 + TMSR6 + TMSR7) is 72, the multiple of 8 (72 % 8 = 0)

W5300 Datasheet(PDF) 59 Page - WIZnet Co., Ltd