Technical data

MVME4100 Single Board Computer Programmer’s Reference (6806800H19B)

3.1.25.4 Counter Register

When enabled the tick timer counter register increments every microsecond. software may

read or write the counter at any time.

3.1.26 Geographical Address Register

The VMEbus Status Register in the Tsi148 provides the VMEbus geographical address of the

MVME4100. This register reflects the inverted states of the geographical address pins at the 5-

row, 160-pin P1 connector. Applications not using the 5-row backplane can use the planar

switch described in the MVME4100 Installation and Use manual to assign a geographical

address.

Table 3-31 Tick Timer Counter Register

REG

Tick Timer 1 Counter Register - 0xF202 0018 (32 bits)

Tick Timer 2 Counter Register - 0xF202 0028 (32 bits)

Tick Timer 3 Counter Register - 0xF202 0038 (32 bits)

Tick Timer 4 Counter Register - 0xF202 0048 (32 bits)

BIT 31 … 0

Field Tick Timer Counter Value

OPER R/W

RESET 0