COM20022I-HT Standard Microsystems (SMSC), COM20022I-HT Datasheet - Page 46

• Manufacturer Part Number: COM20022I-HT
• Manufacturer: Standard Microsystems (SMSC)

Specifications of COM20022I-HT

• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / Rohs Status: Compliant

Revision 09-27-07
BIT
7-0
Terminal Count
Timer Mode
Cycle Mode
BIT NAME
D0-D7
I/O Address 02H
TC7-TC0
TIM7-TIM0
CYC7-CYC0
SYMBOL
High
Figure 6.2
Address Pointer Register
I/O Address 04H
11-Bit Counter
Data Register
Table 6.13 - DMA Count Register
DATASHEET
- Sequential Access Operation
TC7-TC0: Used for non-burst or burst mode. These are the lower 8
bits of the Terminal Count setting register. The MSB (TC8) is in the
Bus Control Register. The Terminal Count setting range is from 1 to
512 counts (TC8 - TC0 all zeroes means 512 counts).
TIM7-TIM0: Used for Programmable-Burst by Timer mode. These bits
are for setting the term of the continuous DMA transfer. The time
range is from 100nS to 25.6 μ S. The step is 100nS (TIM7-TIM0 all
zeroes means 25.6 μ s).
CYC7-CYC0: Used for Programmable-Burst by Cycle mode. These
bits are for setting the term of the continuous DMA transfer. The cycle
range is from 2 to 256 cycles. CYC7-CYC0 all zeroes means 256
cycles. (1 is illegal)
I/O Address 03H
Low
Page 46
Data Bus
Memory
Address Bus
Memory
10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Chip RAM
8
11
DESCRIPTION
INTERNAL
2K x 8
RAM
SMSC COM20022I
Datasheet