Power (VCC and GND)
No Connect (NC)
These pins provide the supply voltage and system reference level for the internal cir-
cuitry of the TS68882. Care should be taken to reduce the noise level on these pins with
appropriate capacitance decoupling.
One pin of the TS68882 package is designated as a no connect (NC). This pin position
is reserved for future use, and should not be used for signal routing or connected to VCC
or GND.
Interfacing Methods
TS68882/TS68020 or TS68030 interfacing
The following paragraphs describe how to connect the TS68882 to a TS68020 or
TS68030 for co-processor operation via an 8-, 16-, or 32-bit data bus.
32-bit Data Bus Co-processor Figure 18 illustrates the co-processor interface connection of a TS68882 to a
Connection TS68020/TS68030 via a 32-bit data bus. The TS68882 is configured to operate over a
32-bit data bus when both the A0 and SIZE pins are connected to VCC
.
16-bit Data Bus Co-processor Figure 19 illustrates the co-processor interface connection of a TS68882 to a
Connection
TS68020/TS68030 via a 16-bit data bus. The TS68882 is configured to operate over a
16-bit data bus when the SIZE pin is connected to VCC, and the A0 pin is connected to
GND. The sixteen least significant data pins (D0-D15) must be connected to the sixteen
most significant data pins (D16 - D31) when the TS68882 is configured to operate over
a 16-bit data bus (i.e., connect D0 to D16, D1 to D17,... and D15 to D31). The DSACK
pins of the two devices are directly connected, although it is not necessary to connect
the DSACK0 pin since the TS68882 never asserts it in this configuration.
8-bit Data Bus Co-processor
Connection
Figure 20 illustrates the connection of a TS68882 to a TS68020/TS68030 as a co-pro-
cessor over an 8-bit data bus. The TS68882 is configured to operate over an 8-bit data
bus when the SIZE pin is connected to GND. The twenty four least significant data pins
(D0-D23) must be connected to eight most significant data pins (D24-D31) when the
TS68882 is configured to operate over an 8-bit data bus (i.e., connect D0 to D8, D16 to
D24; D1 to D9, D17, and D15;... and D7 to D15, D23 and D31). The DSACK pins of the
two devices are directly connected, although it is not necessary to connect the DSACK1
pin since the TS68882 never asserts it in this configuration.
• TS68882/TS68000/TS68008/TS68010 Interfacing
The following paragraphs describe how to connect the TS68882 to a TS68000,
TS68008, or TS68010 processor for operation as a peripheral via an 8- or 16-bit data
bus.
16-bit Data Peripheral
Processor Connection
Figure 21 illustrates the connection of a TS68882 to a TS68000 or TS68010 as a periph-
eral processor over an 16-bit data bus. The TS68882 is configured to operate over an
16-bit data bus when the SIZE pin is connected to VCC, and the A0 pin is connected to
GND. The sixteen least significant data pins (D0-D15) must be connected to the sixteen
most significant data pins (D16 - D31) when the TS68882 is configured to operate over
an 16-bit data bus (i.e., connect D0 to D16, D1 to D17,... and D15 to D31). The DSACK1
pin of the TS68882, is connected to the DTACK pin of the main processor, and the
DSACK0 pin is not used.
34
TS68882
2119A–HIREL–04/02
ATMEL [ ATMEL ]
