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TS68040VFT1U35A View Datasheet(PDF) - Atmel Corporation

Part NameTS68040VFT1U35A Atmel
Atmel Corporation Atmel
DescriptionThird-Generation 32-bit Microprocessor

TS68040VFT1U35A Datasheet PDF : 49 Pages
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Output Buffer Mode
The 68040 is capable of resetting to enable for a combination of either large buffers or
small buffers on the outputs of the miscellaneous control signals, data bus, and address
bus/transfer attribute pins. The large buffers offer quicker output times, which allow for
an easier logic design. However, they do so by driving about 11 times as much current
as the small buffers (refer to TS68040 Electrical specifications for current output). The
designer should consider whether the quicker timings present enough advantage to jus-
tify the additional consideration to the individual signal terminations, the die power
consumption, and the required cooling for the device. Since the TS68040 can be pow-
ered-up in one of eight output buffer modes upon reset, the actual maximum power
consumption for TS68040 rated at a particular maximum operating frequency is depen-
dent upon the power up mode. Therefore, the TS68040 is rated at a maximum power
dissipation for either the large buffers or small buffers at a particular frequency (refer to
TS68040 Electrical specifications). This allows the possibility of some of the thermal
management to be controlled upon reset. The following equation provides a rough
method to calculate the maximum power consumption for a chosen output buffer mode:
= Max. power dissipation for output buffer mode
= Max. power dissipation for small buffer mode
(all outputs)
= Max. power dissipation for large buffer mode
(all outputs)
PINSLB = Number of pins large buffer mode
PINSCLB = Number of pins capable of the large buffer
Table 6 shows the simplified relationship on the maximum power dissipation for eight
possible configurations of output buffer modes.
Table 6. Maximum Power Dissipation for Output Buffer Mode Configurations
Output Configuration
Maximum Power Dissipation
Address Bus and
Misc. Control
Data Bus
Transfer Attrib.
Small Buffer
Small Buffer
Small Buffer
Small Buffer
Large Buffer
Large Buffer
Large Buffer
Large Buffer
Small Buffer
Small Buffer
Large Buffer
Large Buffer
Small Buffer
Small Buffer
Large Buffer
Large Buffer
Small Buffer
Large Buffer
Small Buffer
Large Buffer
Small Buffer
Large Buffer
Small Buffer
Large Buffer
PDSB + (PDLB - PDSB) · 13%
PDSB + (PDLB - PDSB) · 52%
PDSB + (PDLB - PDSB) · 65%
PDSB + (PDLB - PDSB) · 35%
PDSB + (PDLB - PDSB) · 48%
PDSB + (PDLB - PDSB) · 87%
PDSB + (PDLB - PDSB) · 100%
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The TS68040 is Atmel’s third generation of 68000-compatible, high-performance, 32-bit microprocessors. The TS68040 is a virtual memory microprocessor employing multiple, concurrent execution units and a highly integrated architecture to provide very high performance in a monolithic HCMOS device.

• 26-42 MIPS Integer Performance
• 3.5-5.6 MFLOPS Floating-Point-Performance
• IEEE 754-Compatible FPU
• Independent Instruction and Data MMUs
• 4K bytes Physical Instruction Cache and 4K bytes Physical Data Cache Accessed Simultaneously
• 32-bit, Nonmultiplexed External Address and Data Buses with Synchronous Interface
• User-Object-Code Compatibility with All Earlier TS68000 Microprocessors
• Multimaster/Multiprocessor Support via Bus Snooping
• Concurrent Integer Unit, FPU, MMU, Bus Controller, and Bus Snooper Maximize Throughput
• 4G bytes Direct Addressing Range
• Software Support Including Optimizing C Compiler and UNIX® System V Port
• IEEE P 1149-1 Test Mode (JTAG)
• f = 25 MHz, 33 MHz; VCC = 5V ± 5%; PD = 7W
• The Use of the TS88915T Clock Driver is Suggested


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