adsp-21991 Analog Devices, Inc., adsp-21991 Datasheet - Page 15

• Manufacturer Part Number: adsp-21991
• Description: Mixed Signal Dsp Controller
• Manufacturer: Analog Devices, Inc.

pins have a logic level hold circuit that prevents input from
floating internally. PWMTRIP has an internal pull-down, but
should not be left floating to avoid unnecessary PWM shutdowns.
Table 4. Pin Descriptions
REV. 0
Pin
A19–0
D15–0
RD
WR
ACK
BR
BG
BGH
MS0
MS1
MS2
MS3
IOMS
BMS
CLKIN
XTAL
CLKOUT
BYPASS
RESET
POR
BMODE2
BMODE1
BMODE0
TCK
TMS
TDI
TDO
TRST
EMU
VIN0
VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
ASHAN
BSHAN
CAPT
CAPB
VREF
SENSE
CML
CONVST
PF15
PF14
PF13
Type
D, OT
D, BT
D, OT
D, OT
D, I
D, I, PU
D, O
D, O
D, OT
D, OT
D, OT
D, OT
D, OT
D, OT
D, I, CKG
D, O, CKG
D, O
D, I, PU
D, I, PU
D, O
D, I, PU
D, I, PD
D, I, PU
D, I
D, I, PU
D, I, PU
D, OT
D, I, PU
D, OT, PU
A, I
A, I
A, I
A, I
A, I
A, I
A, I
A, I
A, I
A, I
A, O
A, O
A, I, O
A, I
A, O
D, I
D, BT, PD
D, BT, PD
D, BT, PD
–15–
Function
External Port Address Bus
External Port Data Bus
External Port Read Strobe
External Port Write Strobe
External Port Access Ready Acknowledge
External Port Bus Request
External Port Bus Grant
External Port Bus Grant Hang
External Port Memory Select Strobe 0
External Port Memory Select Strobe 1
External Port Memory Select Strobe 2
External Port Memory Select Strobe 3
External Port IO Space Select Strobe
External Port Boot Memory Select Strobe
Clock Input/Oscillator Input/Crystal Connection 0
Oscillator Output/Crystal Connection 1
Clock Output (HCLK)
PLL Bypass Mode Select
Processor Reset Input
Power on Reset Output
Boot Mode Select Input 2
Boot Mode Select Input 1
Boot Mode Select Input 0
JTAG Test Clock
JTAG Test Mode Select
JTAG Test Data Input
JTAG Test Data Output
JTAG Test Reset Input
Emulation Status
ADC Input 0
ADC Input 1
ADC Input 2
ADC Input 3
ADC Input 4
ADC Input 5
ADC Input 6
ADC Input 7
Inverting SHA_A Input
Inverting SHA_B Input
Noise Reduction Pin
Noise Reduction Pin
Voltage Reference Pin (Mode Selected by State of SENSE)
Voltage Reference Select Pin
Common-Mode Level Pin
ADC Convert Start Input
General-Purpose IO15
General-Purpose IO14
General-Purpose IO13
The following symbols appear in the Type column of
G = Ground, I = Input, O = Output, P = Power Supply,
B = Bidirectional, T = Three-State, D = Digital, A = Analog,
CKG = Clock Generation pin, PU = Internal Pull-up, and
PD = Internal Pull-Down.
ADSP-21991
Table
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