NEC DB2000, Service Manual

Page: 127 / 199

50 RSTB I Reset bar.
51 EXTDI I, PD* External digital input. Clears prior to each Rx buffer.
52 VSS gnd Digital ground.
53 IBF I SIO input buffer full.
54 TCK I JTAG test clock.
55 TMS I, PU*** JTAG test mode select.
56 TDO O JTAG test data output.
57 TDI I, PU*** JTAG test data input.
58 VDDP pwr PLL supply.
59--60 MC(1:2) I Small signal master clock input.
61 VSSP gnd PLL ground.
62 TRST I,PU*** JTAG test reset.
63 OBE O** SIO output buffer empty.
64 DO O** SIO data output.
65 DI I SIO data input.
66 ILD I/O** SIO input load.
67 ICK I/O** SIO input clock.
68 VDD pwr 3V digital supply.
69 VSS gnd Digital ground.
70 OCK I/O** SIO output clock.
71 OLD I/O** SIO output load.
72-75 IOBIT(7:4) I/O** Status/control bits (7-4).
76 GNDB gnd Baseband analog ground.
77 RXQN I, A Baseband receive Q component negative output.
78 RXQP I, A Baseband receive Q component positive output.
79 RXIN I, A Baseband receive I component negative output.
80 RXIP I,A Baseband receive I component positive output.
81 TXVCM I/O, A Baseband TX external ref. Sets common mode of I’s and Q’s.
82 VADCM O, A Baseband 1.4V analog reference for ADC.
83 VADN O, A Baseband reference for ADC negative.
84 VADP O, A Baseband reference for ADC positive.
85 VDDB pwr 3V baseband analog supply.
86 TXQN O, A Baseband transmit Q component negative output.
87 TXQP O, A Baseband transmit Q component positive output.
88 TXIN O, A Baseband transmit I component negative output.
89 TXIP O, A Baseband transmit I component positive output.
90 TXP O, A Baseband transmit power control.
91 GNDD gnd Quiet digital ground.
92 VDDD pwr 3V quiet digital supply.
93 AOUTAN O, A Voice band negative output number 1.
94 AOUTAP O, A Voice band positive output number 1.
95 AOUTBN O, A Voice band negative output number 2.
96 AOUTBP O, A Voice band positive output number 2.
97 REFC A Voice band external cap for internal voltage regulator.
98 AUXOUT O, A Voice band auxiliary output.
99 AUXIN I, A Voice band auxiliary input.
100 VXVCM A Voice band external bypass capacitor, reference.
* On-Chip pull-down resistor.
** 3-states when RSTB = 0, or by JTAG control.
*** On-chip, pull-up resistor.