W7100A datasheet(39/160 Pages) WIZNET

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W7100A Datasheet v1.2.5

TCPIPCore, Internal flash WTST value means below access time in table 2.4.

Table 2.6 TCPIPCore / Flash WTST Bit Values

WTST

Pulse Width[clock]

2.5.7 Address Latch Enable Register

ALECON SFR is used for standard 8051 external pin access mode. The time duration of ALE

(Address Latch Enable) signal can be controlled by ALECON SFR.

If we set the ALECON to 1, ALE signal will be down to ‘0’ after 1 clock. If we set it to ‘n’,

ALE signal maintains 1+n clock and down to ‘0’.

ALE maintain duration = ALECON value + 1 clock

The initial value of ALECON is 0xFF. User can configure this value depending on external

device speed.

ALECON (0x9F)

Reset

AC.7

AC.6

AC.5

AC.4

AC.3

AC.2

AC.1

AC.0

0xFF

Figure 2.24 Internal Memory Wait States Register

2.5.8 External Memory Wait States Register

EXTWTST SFR is used for configuring the timing of external memory access. Using the 16bit

of this SFR user can control the value from 0 to 65535.

EXTWTST0 (0x9D)

Reset

EW.7

EW.6

EW.5

EW.4

EW.3

EW.2

EW.1

EW.0

0xFF

Figure 2.25 First Byte of Internal Memory Wait States Register

EXTWTST1 (0x9E)

Reset

EW.15

EW.14

EW.13

EW.12

EW.11

EW.10

EW.9

EW.8

0xFF

Figure 2.26 Second Byte of Internal Memory Wait States Register

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