ADSP-21990BST Analog Devices Inc, ADSP-21990BST Datasheet - Page 32

• Manufacturer Part Number: ADSP-21990BST
• Description: IC DSP CONTROLLER 16BIT 176LQFP
• Manufacturer: Analog Devices Inc
• Series: ADSP-21xxr
• Type: Fixed Pointr

Specifications of ADSP-21990BST

• Rohs Status: RoHS non-compliant
• Interface: SPI, SSP
• Clock Rate: 160MHz
• Non-volatile Memory: External
• On-chip Ram: 20kB
• Voltage - I/o: 3.30V
• Voltage - Core: 2.50V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 176-LQFP

ADSP-21990
External Port Bus Request/Grant Cycle Timing
Table 11
bus grant operations.
Table 11. External Port Bus Request and Grant Cycle Timing
1
2
Parameter
Timing Requirements
t
t
Switching Characteristics
t
t
t
t
t
t
t
These are timing parameters that are based on worst-case operating conditions.
BS
BH
SD
SE
DBG
EBG
DBH
EBH
HCLK
is the peripheral clock period.
and
CLKOUT
1, 2
MS3–0
Figure 12
A21–0
IOMS
BMS
BGH
BR
WR
RD
BG
BR Asserted to CLKOUT High Setup
CLKOUT High to BR Deasserted Hold Time
CLKOUT High to xMS, Address, and RD/WR Disable
CLKOUT Low to xMS, Address, and RD/WR Enable
CLKOUT High to BG Asserted Setup
CLKOUT High to BG Deasserted Hold Time
CLKOUT High to BGH Asserted Setup
CLKOUT High to BGH Deasserted Hold Time
describe external port bus request and
t
BS
Figure 12. External Port Bus Request and Grant Cycle Timing
t
Rev. A | Page 32 of 50 | August 2007
BH
t
t
t
t
t
DBG
DBH
SD
SD
SD
Min
4.6
0
0
0
0
0
0
Max
0.5t
4
4
4
4
4
HCLK
t
t
EBG
EBH
+ 1
t
t
t
SE
SE
SE
ns
ns
ns
Unit
ns
ns
ns
ns
ns