3 v tai interface ac characteristics – AMD Am79C930 User Manual
Page 145
P R E L I M I N A R Y
AMD
145
Am79C930
3.3 V TAI INTERFACE AC CHARACTERISTICS
Parameter
Symbol
Parameter Description
Test Conditions
Min
Max
Unit
t
CLKIN
CLKIN Period
50
ns
t
CLIN
CLKIN Low time
22
ns
t
CHIN
CLKIN High time
22
ns
t
INHL
CLKIN Fall time
Note 8
3
ns
t
INLH
CLKIN Rise time
Note 8
3
ns
t
RXC
RXC Period
Note 5
1000
ns
t
CLRX
RXC Low time
Note 5
480
ns
t
CHRX
RXC High time
Note 5
480
ns
t
RXHL
RXC Fall time
Note 8
20
ns
t
RXLH
RXC Rise time
Note 8
20
ns
t
TXC
TXC Period
Notes 1, 5, 7
1000
ns
t
CLTX
TXC Low time
Notes 1, 5, 7
495
ns
t
CHTX
TXC High time
Notes 1, 5, 7
495
ns
t
TXHL
TXC Fall time
Notes 1, 8
5
ns
t
TXLH
TXC Rise time
Notes 1, 8
5
ns
t
TXCO
TXC Period
Notes 2, 7
1000
ns
t
CLTXO
TXC Low time
Notes 2, 7
585
ns
t
CHTXO
TXC High time
Notes 2, 7
385
ns
t
TXHLO
TXC Fall time
Notes 2, 8
15
ns
t
TXLHO
TXC Rise time
Notes 2, 8
15
ns
t
RXDS
RXD setup time to RXC
↑
Note 6
110
ns
t
RXDH
RXD hold time from RXC
↑
Note 6
10
ns
t
TXDD
TXD delay from TXC
↓
Notes 1, 3
10
200
ns
t
TXDS
TXD setup time to TXC
↑
Notes 2, 4
T
CLTX
-165
ns
t
TXDH
TXD hold time from TXC
↑
Notes 2, 4
T
CHTX
ns
t
TXDV
TXD delay from TXC
↓
Notes 2, 3
0
150
ns
Notes:
1. Only applicable when TXC has been configured as an INPUT.
2. Only applicable when TXC has been configured as an OUTPUT.
3. MIN value not tested.
4. Parameter calculated from other parameters.
5. Clock period must correlate to data rate as specified in DR bits of TCR30. Note that data rate is a function of DR and T
CLKIN
and
CLKGT20 bit of MIR9.
6. The values for these parameters are given for the case with CLKP = 0 (TCR2[4:0]). For nonzero values of CLKP, use the
following formulas:
If CLKGT20 = 0 (MIR9[7]),
t
RXDS
min = 110–CLKP X T
CLKIN
t
RXDH
min = 10+CLKP X T
CLKIN
If CLKGT20 = 1 (MIR9[7]),
t
RXDS
min = 110–CLKP X T
CLKIN
X 2
t
RXDH
min = 10+CLKP X T
CLKIN
X 2
7. Values given are for data rate of 1Mb/s. For other data rates,
t
TXC
is 1/DR, where DR = data rate in Hertz,
t
CLTX
is 60% of T
TXC
minus T
TXHL
,
t
CHTX
is 40% of T
TXC
minus T
TXHL
,
t
TXCO
is 1/DR, where DR = data rate in Hertz,
t
CLTXO
is 60% of T
TXCO
minus T
TXHLO
,
t
CHTXO
is 40% of T
TXCO
minus T
TXHLO
,
t
TXHLO
is 15 ns, regardless of DR value,
t
TXLHO
is 15 ns, regardless of DR value.
8. Parameter not included in the production test.