Datasheet

ADSP-TS101S
Rev. C | Page 31 of 48 | May 2009
Table 31. Link Ports—Token Switch, Token Master
Parameter Min Max Unit
Timing Requirements
t
REQI
Token Request Input Width 5.0  t
L X CLK_R X
ns
t
TKRQ
Token Request from Token Enable
1
3.0  t
L X CLK_T X
ns
Switching Characteristics
t
TKENO
Token Switch Enable Output 8.0  t
L X CLK_T X
ns
t
REQO
Token Request Output Width
2
6.0  t
L X CLK_T X
ns
1
For guaranteeing token switch during token enable.
2
LxCLKOUT shows both possible responses to the token request: [1] a “Token Grant” (LxCLKOUT remains high), and [2] a “Token Regret” (LxCLKOUT goes low).
Figure 19. Link Ports—Token Switch, Token Master
Table 32. Link Ports—Token Switch, Token Requester
Parameter Min Max Unit
Timing Requirements
t
TKENI
1
Token Switch Enable Input 8.0  t
L X CLK_R X
ns
Switching Characteristics
t
REQO
Token Request Output Width
2
6.0  t
L X CLK_R X
ns
1
Required whenever there is a break in transmission.
2
LxCLKOUT shows both possible responses to the token request: [1] a “Token Grant” (LxCLKOUT remains high), and [2] a “Token Regret” (LxCLKOUT goes low).
Figure 20. Link Ports—Token Switch, Token Requester
LxCLKIN
LxCLKOUT
14
15
t
TKENO
t
REQO
t
TKRQ
t
REQI
LxCLKIN
(FOR TO K EN
REGRE T)
LxCLKOUT
(FOR T OK EN
GRANT)
0
1
2
3
LxCLKIN
(FOR TO K EN
GRANT)
1412
13 15
LxCLKOUT
(FOR T OK EN
REGRET)
1412
13 15
t
TKEN I
t
TKRQ
t
REQO
t
REQO
t
TKENI
t
TKRQ
t
REQO