ADSP-21062/ADSP-21062L
Link Ports: 2 ؋
CLK Speed Operation
from 2 × speed specifications will result in unrealistically small
skew times because they include multiple tester guardbands. The
setup and hold skew times shown below are calculated to include
only one tester guardband.
Calculation of link receiver data setup and hold relative to link
clock is required to determine the maximum allowable skew that
can be introduced in the transmission path between LDATA
and LCLK. Setup skew is the maximum delay that can be intro-
duced in LDATA relative to LCLK, (setup skew = tLCLKTWH
min – tDLDCH – tSLDCL). Hold skew is the maximum delay that
can be introduced in LCLK relative to LDATA, (hold skew =
tLCLKTWL min – tHLDCH – tHLDCL). Calculations made directly
ADSP-21062 Setup Skew = 1.84 ns max
ADSP-21062 Hold Skew
= 2.78 ns max
ADSP-21062L Setup Skew = 2.10 ns max
ADSP-21062L Hold Skew = 1.87 ns max
ADSP-21062
ADSP-21062L
Max
Parameter
Min
Max
Min
Units
Receive
Timing Requirements:
tSLDCL
tHLDCL
tLCLKIW
Data Setup Before LCLK Low
Data Hold After LCLK Low
LCLK Period (2 × Operation)
2.5
2.25
tCK/2
4.5
4
2.25
2.25
tCK/2
5.25
4
ns
ns
ns
ns
ns
tLCLKRWL LCLK Width Low
tLCLKRWH LCLK Width High
Switching Characteristics:
tDLAHC
tDLALC
LACK High Delay After CLKIN High
18 + DT/2
6
28.5 + DT/2
16
18 + DT/2
6
29.5 + DT/2
16
ns
ns
LACK Low Delay After LCLK High1
Transmit
Timing Requirements:
tSLACH LACK Setup Before LCLK High
tHLACH LACK Hold After LCLK High
19
–6.75
19
–6.5
ns
ns
Switching Characteristics:
tDLCLK
tDLDCH
tHLDCH
LCLK Delay After CLKIN
Data Delay After LCLK High
Data Hold After LCLK High
8
2.25
8
2.25
ns
ns
ns
ns
ns
–2.0
(tCK/4) – 1
–2.25
(tCK/4) – 1
tLCLKTWL LCLK Width Low
tLCLKTWH LCLK Width High
(tCK/4) + 1.25
(tCK/4) – 1.25 (tCK/4) + 1
(tCK/4) + 1.5
(tCK/4) – 1.5 (tCK/4) + 1
tDLACLK
LCLK Low Delay After LACK High
(tCK/4) + 9 (3 × tCK/4) + 16.5 (tCK/4) + 9
(3 × tCK/4) + 16.5 ns
NOTE
1LACK will go low with tDLALC relative to rising edge of LCLK after first nibble is received. LACK will not go low if the receiver’s link buffer is not about to fill.
REV. C
–34–
ADI [ ADI ]
