Datasheet
Rev. D | Page 30 of 52 | May 2013
ADSP-21061/ADSP-21061L
Multiprocessor Bus Request and Host Bus Request
Use these specifications for passing of bus mastership between
multiprocessing ADSP-21061s (BRx
) or a host processor, both
synchronous and asynchronous (HBR
, HBG).
Table 16. Multiprocessor Bus Request and Host Bus Request
5 V and 3.3 V
Unit
Parameter Min Max
Timing Requirements
t
HBGRCSV
HBG Low to RD/WR/CS Valid
1
20 + 5DT/4 ns
t
SHBRI
HBR Setup Before CLKIN
2
20 + 3DT/4 ns
t
HHBRI
HBR Hold After CLKIN
2
14 + 3DT/4 ns
t
SHBGI
HBG Setup Before CLKIN 13 + DT/2 ns
t
HHBGI
HBG Hold After CLKIN High 6 + DT/2 ns
t
SBRI
BRx, CPA Setup Before CLKIN
3
13 + DT/2 ns
t
HBRI
BRx, CPA Hold After CLKIN High 6 + DT/2 ns
t
SRPBAI
RPBA Setup Before CLKIN 20 + 3DT/4 ns
t
HRPBAI
RPBA Hold After CLKIN 12 + 3DT/4 ns
Switching Characteristics
t
DHBGO
HBG Delay After CLKIN 7 – DT/8 ns
t
HHBGO
HBG Hold After CLKIN –2 – DT/8 ns
t
DBRO
BRx Delay After CLKIN 5.5 – DT/8 ns
t
HBRO
BRx Hold After CLKIN –2 – DT/8 ns
t
DCPAO
CPA Low Delay After CLKIN
4
6.5 – DT/8 ns
t
TRCPA
CPA Disable After CLKIN –2 – DT/8 4.5 – DT/8 ns
t
DRDYCS
REDY (O/D) or (A/D) Low from CS and HBR Low
5,
6
8ns
t
TRDYHG
REDY (O/D) Disable or REDY (A/D) High from HBG
5,
7
44 + 27DT/16 ns
t
ARDYTR
REDY (A/D) Disable from CS or HBR High
5
10 ns
1
For first asynchronous access after HBR and CS asserted, ADDR31-0 must be a non-MMS value 1/2 t
CK
before RD or WR goes low or by t
HBGRCSV
after HBG goes low. This is
easily accomplished by driving an upper address signal high when HBG is asserted. See the “Host Processor Control of the ADSP-21061” section in the ADSP-2106x SHARC
User’s Manual.
2
Only required for recognition in the current cycle.
3
CPA assertion must meet the setup to CLKIN; deassertion does not need to meet the setup to CLKIN.
4
For the ADSP-21061L (3.3 V), this specification is 8.5 – DT/8 ns max.
5
(O/D) = open drain, (A/D) = active drive.
6
For the ADSP-21061L (3.3 V), this specification is 12 ns max.
7
For the ADSP-21061L (3.3 V), this specification is 40 + 23DT/16 ns min.