COM20022I3V-HD SMSC, COM20022I3V-HD Datasheet - Page 42

• Manufacturer Part Number: COM20022I3V-HD
• Description: Network Controller & Processor ICs ARCNET Contrllr
• Manufacturer: SMSC

Specifications of COM20022I3V-HD

• Data Rate: 10 Mbps
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-48
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Revision 02-27-06
3,2,1 Clock Prescaler
BIT
7
6
5
4
0
Pulse1 Mode
Four NACKS
Reserved
Receive All
Bits 3,2,1
Slow Arbitration
Select
BIT NAME
P1MODE
FOUR
NACKS
RCVALL
CKP3,2,1
SLOWARB
SYMBOL
Table 6.12 - Setup 1 Register
DATASHEET
This bit determines the type of PULSE1 output driver used
in Backplane Mode. When high, a push/pull output is
used. When low, an open drain output is used. The
default is open drain.
This bit, when set, will cause the EXNACK bit in the
Diagnostic Status Register to set after four NACKs to Free
Buffer Enquiry are detected by the COM20022I 3V. This
bit, when reset, will set the EXNACK bit after 128 NACKs
to Free Buffer Enquiry. The default is 128.
Do not set.
This bit, when set, allows the COM20022I 3V to receive all
valid data packets on the network, regardless of their
destination ID. This mode can be used to implement a
network monitor with the transmitter on- or off-line. Note
that ACKs are only sent for packets received with a
destination ID equal to the COM20022I 3V's programmed
node ID. This feature can be used to put the COM20022I
3V in a 'listen-only' mode, where the transmitter is
disabled and the COM20022I 3V is not passing tokens.
Defaults low.
These bits are used to determine the data rate of the
COM20022I 3V. The following table is for a 20 MHz
crystal: (Clock Multiplier is bypassed)
Note: The lowest data rate achievable by the COM20022I
This bit, when set, will divide the arbitration clock by 2.
Memory cycle times will increase when slow arbitration is
selected.
Note: For clock multiplier output clock speeds greater
CKP3
0
0
0
0
1
Page 42
3V is 156.25Kbs. Defaults to 000 or 2.5Mbs. For
Clock Multiplier output clock speed greater than 20
MHz, CKP3, CKP2 and CKP1 must all be zero.
than 40 MHz, SLOWARB must be set. Defaults to
low.
CKP2
0
0
1
1
0
10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Board RAM
CKP1
0
1
0
1
0
DESCRIPTION
DIVISOR
128
16
32
64
8
156.25Kbs
312.5Kbs
1.25Mbs
SPEED
625Kbs
2.5Mbs
SMSC COM20022I 3V
Datasheet