Data Sheet

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 TX Base Address (hereafter we'll call gSn_TX_BASE) and Socket n 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