Data Sheet
June 2001
DSP16410B Digital Signal Processor
24
Agere Systems—Proprietary
Use pursuant to Company instructions
Agere Systems Inc.
4 Hardware Architecture
(continued)
4.3 Device Reset
(continued)
4.3.2 RSTN Pin Reset
(continued)
Table 3
defines the states of the output and bidirectional pins both during and after reset. It does not include the
TDO0 and TDO1 output pins because their state is not affected by RSTN. The state of TDO0 and TDO1 are
affected only by the JTAG0 and JTAG1 controllers.
4.3.3 JTAG Controller Reset
The recommended method of resetting the JTAG controllers is to assert RSTN, TRST0N, and TRST1N low simul-
taneously. An alternate method is to clock TCK
0,1
through at least five cycles with TMS
0,1
held high. Both
methods ensure that the user has control of the device pins. JTAG controller reset places it in the test logic reset
(TLR) state and does not initialize user registers, synchronize internal clocks, or initiate code execution unless
RSTN is also asserted (see
Section 6.2.4 on page 246
).
Table 3. State of Device Output and Bidirectional Pins During and After Reset
Type
Pin
Condition
State of Pin
During Reset (RSTN = 0)
3-state
logic high
Initial State of Pin
After Reset (RSTN = 1)
logic low
initial inactive state
Output
PIBF, PINT, PRDY
EACKN, EION, ERAMN,
EROMN, ERWN0, ERWN1
—
INT0 = 0
(deasserted)
INT0 = 1
(asserted)
—
—
INT0 = 0
(deasserted)
INT0 = 1
(asserted)
INT0 = 0
(deasserted)
INT0 = 1
(asserted)
INT0 = 0
(deasserted)
INT0 = 1
(asserted)
—
3-state
POBE
3-state
3-state
logic low
logic high
3-state
CKI/2
SOD0, SOD1
ECKO
3-state
EA[18:0]
logic low
initial inactive state
3-state
ESEG[3:0]
logic low
logic low
3-state
Bidirectional
(Input/Output)
IO0BIT[6:0], IO1BIT[6:0],
PD[15:0], SICK0, SICK1,
SIFS0, SIFS1, SOCK0,
SOCK1, SOFS0, SOFS1,
TRAP
ED[31:0]
3-state
configured as input
EYMODE = 0
EYMODE = 1
3-state
output
3-state
output