Specifications

MODE Pin

The MODE pin determines whether the TNT4882 enters Turbo+7210 mode or Turbo+9914 mode after a hardware

reset. For the above interface, MODE was left unconnected so that the TNT4882 enters the Turbo+7210 mode. See

the MODE & SWAPN Pin Recommendations section of the TNT4882 Programmer Reference Manual.

SWAPN Pin

The TNT4882 samples the SWAPN pin during a hardware reset. If SWAPN is asserted during a hardware reset, the

SWAP bit is set. For the above interface, SWAPN pin was left unconnected. See the MODE & SWAPN Pin

Recommendations section of the TNT4882 Programmer Reference Manual.

FIFO_RDY Pin

The FIFO_RDY output indicates that the FIFOs are ready for at least 8 word (or byte) transfers. Since we did not have

any use for FIFO_RDY, it was left unconnected.

ABUS_OEN and BBUS_OEN

The ABUS_OEN output asserts when the TNT4882 drives Data Bus A during a read access. The BBUS_OEN output

asserts when the TNT4882 drives Data Bus B during a read access. Since we did not have any use for the above pins,

they were left unconnected.

BURST_RDN

When BURST_RDN is asserted, the TNT4882C drives Data Bus A and Data Bus B with the next word to be read from

the FIFOs. BURST_RDN does not remove data from the FIFOs. For the above interface, BURST_RDN was left

unconnected.

Key Pins (KEYRSTN, KEYDQ, KEYCLKN)

The key pins are designed to be connected to a Dallas Semiconductor DS1204U Electronic Key. Applications that do

not use the key can leave the key pins unconnected.

GPIB Device Status Pins

The TNT4882 has five device status pins: TADCS, LADCS, TRIG, DCAS, and REM. All device status pins are output

only so we left them unconnected. For further description of the status pins, refer to the TNT4882 Programmer

Reference Manual.

GPIB Signal Pins

Connect the GPIB signal pins directly to a GPIB connector.

Oscillator Pins (XTALI, XTALO)

A 40-MHz oscillator is required to drive the clock signal. Connect the oscillator output to the XTALI pin of the

TNT4882; leave the XTALO pin unconnected.

Vcc and GND Pins

Supply power to all the Vcc pins and connect the ground signal to all the GND pins.