Data Sheet

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iEthernet W5200

Figure 7 Physical Address Calculation

But this value itself is not the physical address to read. So, the physical address should be

calculated as follow.

1. Socket n-th TX Base Address (hereafter we'll call gSn_TX_BASE) and Socket n-th TX

Mask Address (hereafter we'll call gSn_TX_MASK) are calculated on TMSR value. Refer

to the psedo code of the Initialization if detail is needed.

2. The bitwise-AND operation of two values, Sn_TX_WR and gSn_TX_MASK give result to

the offset address(hereafter we'll call get_offset) in TX memory range of the socket.

3. Two values get_offset and gSn_TX_BASE are added together to give result tothe

physical address(hereafter, we'll call get_start_address).

Now, write the transmission data to get_start_address as large as you want. (* There's a case

that it exceeds the TX memory upper-bound of the socket while writing. In this case, write

Socket 7 (2K)

Socket 6 (2K)

Socket 5 (2K)

Socket 4 (2K)

Socket 3 (2K)

Socket 0 (2K)

Socket 2 (2K)

Socket 1 (2K)

Socket 0

0x8000

0x8800

0x9000

0x9800

0xA000

0xA800

0xB000

0xB800

0xC000

0x8000

0x8800

0x87EE

If S0_TX_WR0 = 0x8FEE,

Real Physical Address is

0x8000 + (0x8FEE & 0x07FF) =

0x87EE

18 bytes

Socket 0

494 bytes

Socket 0

0x8000

0x87EE

0x8800

0x8000

0x8800

0x81EE

0x8800 – 0x87EE = 0x12,

18 bytes write

and remain 494 bytes.

And physical Address

changes to 0x8000

Real Physical Address is

0x8000 + 0x01EE(494) =

0x81EE.

S0_TX_WR0 is

0x8FEE + 0x0200 = 0x91EE

Chip Base Address = 0x0000, 512(0x0200) bytes send