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UP-5900VS
CIRCUIT DESCRIPTION
5 – 12
10. CHIPSET (NORTH BRIDGE)
Intel’s 82443BX is used.
10-1. PIN ASSIGHMENTS
10-2. PIN DISCRIPTION1)HOST INTERFACE SIGNALS
1) Host Interface Signals
■
■
■
■
Host Interface Signals
1
2
3
4
5
6
7
8
9
10
11
12
13
A
VSS
AD20
PCIRST#
AD25
AD29
PREQ0#
HD56#
HD62#
HD55#
HD54#
HD49#
HD47#
HD40#
B
VCC
PCLKIN
AD22
AD27
AD28
PHOLD#
HD50#
HD61#
HD63#
HD53#
HD48#
HD42#
HD36#
C
AD19
REFVCC
AD21
C/BE3#
VSS
AD31
PREQ1#
HD52#
VSS
HD60#
HD59#
HD51#
HD44#
D
AD16
AD18
AD17
AD23
AD26
PHLDA#
PGNT1#
PREQ3#
HD58#
PREQ4#
HD46#
HD41#
HD39#
E
IRDY#
FRAME#
VSS
C/BE2#
AD24
AD30
PGNT0#
PGNT3#
PGNT4#
PGNT2#
HD57#
VSS
HD45#
F
SERR#
PLOCK#
DEVSEL#
STOP#
TRDY#
VSS
VCC
VSS
VCC
PREQ2#
G
AD13
AD14
C/BE1#
AD15
PAR
VCC
H
AD8
AD7
AD10
AD12
AD11
VSS
J
AD5
AD6
VSS
C/BE0#
AD9
VCC
K
SBA0
AD1
AD3
AD2
AD4
AD0
L
ST2
ST1
GGNT#
ST0
GREQ#
VCC
VSS
VCC
M
SBA2
SBA1
PIPE#
RBF#
VSS
VSS
VCC
VSS
N
VSS
SBA3
SBSTB
AGPREF
GCLKIN
VCC
VSS
VSS
P
VCC
SBA4
SBA6
SBA5
GCLKO
VCC
VSS
VSS
R
SBA7
GAD31
GAD29
GAD30
VSS
VSS
VCC
VSS
T
GAD27
GAD26
GAD24
GAD25
ADSTB_B
VCC
VSS
VCC
U
GAD23
GC/BE3#
GAD22
GAD21
GAD19
GAD28
V
GAD20
GAD17
VSS
GC/BE2#
GIRDY#
VCC
W
GAD16
GAD18
GFRAME#
GTRDY#
GDEVSEL#
VSS
Y
GSTOP#
GPAR
GAD15
GC/BE1#
GAD14
VCC
AA
GAD13
GAD12
GAD10
GAD11
GAD9
VSS
VCC
VSS
VCC
MECC1
AB
GAD8
GC/BE0#
VSS
GAD7
GAD0
MD34
MD5
MD8
MD9
MD12
MD46
VSS
SCASB#
AC
GAD6
ADSTB_A
GAD5
CLKRUN#
MD32
MD35
MD6
MD39
MD10
MD13
MD47
WEB#
DQMA1
AD
GAD4
GAD3
GAD2
SUSTAT#
VSS
MD3
MD37
MD40
VSS
MD44
MD15
MECC5
DQMA0
AE
VCC
GAD1
WSC#
MD1
MD33
MD4
MD38
MD42
MD11
MD45
MECC0
WEA#
DQMB1
AF
VSS
VCC
BXPWROK
MD0
MD2
MD36
MD7
MD41
MD43
MD14
MECC4
SCASA#
VSS
14
15
16
17
18
19
20
21
22
23
24
25
26
VSS
HD33#
HD31#
HD27#
HD19#
HD20#
HD10#
HD6#
HD3#
HA29#
HA24#
HA22#
VSS
A
HD43#
HD32#
HD29#
HD25#
HD21#
HD18#
HD12#
HD8#
HD0#
CPURST#
HA27#
HA20#
BREQ0#
B
HD37#
HD28#
HD26#
HD22#
VSS
HD17#
HD7#
HD5#
VSS
HA26#
HA28#
HA23#
HA21#
C
HD34#
HD35#
HD30#
HD24#
HD16#
HD15#
HD14#
HD4#
HD1#
HA31#
HA25#
HA18#
HA19#
D
HD38#
VSS
GTLREFB
HD23#
HD13#
HD11#
HD9#
HD2#
HA30#
HA15#
VSS
HA17#
HA16#
E
VTTB
VCC
VSS
VCC
VSS
HA11#
HA12#
HA13#
HA14#
HA8#
F
VCC
HA10#
HA5#
HA7#
HA3#
HA9#
G
VSS
HA4#
HA6#
BNR#
HTRDY#
BPRI#
H
VCC
HREQ0#
HREQ1#
VSS
HREQ4#
DEFER#
J
ADS#
HLOCK#
DRDY#
HREQ2#
HREQ3#
RS0#
K
VCC
VSS
VCC
HITM#
DBSY#
HIT#
RS2#
RS1#
L
VSS
VCC
VSS
VSS
GTLREFA
VTTA
TESTIN#
CRESET#
M
VSS
VSS
VCC
VCC
HCLKIN
VSS
MD31
VCC
N
VSS
VSS
VCC
NC
MD30
MD62
MD63
VSS
P
VSS
VCC
VSS
VSS
MD60
MD28
MD29
MD61
R
VCC
VSS
VCC
MD25
MD26
MD57
MD58
MD27
T
MD59
MD54
MD24
MD23
MD55
MD56
U
VCC
MD51
MD52
VSS
MD53
MD22
V
VSS
MD50
MD18
MD19
MD21
MD20
W
VCC
MECC7
MD48
MD16
MD17
MD49
Y
SRASB#
VCC
VSS
VCC
VSS
DQMA6
MECC2
DQMA7
MECC6
MECC3
AA
CSA0#
VSS
MAA1
MAB3#
MAB6#
MAB7#
MAB10
DCLKO
NC
CSB5#
VSS
VSS
DQMA3
AB
DQMA5
CSA3#
MAB1#
MAA3
MAA7
MAA8
MAB9#
MAA12
CKE0
CKE4
CSB3#
DQMA2#
CSB4#
AC
DQMB5
CSA4#
MAB0#
MAB2#
VSS
MAB5#
MAA10
MAB12#
VSS
CKE3
CSB1#
DCLKWR
CSB2#
AD
DQMA4
CSA2#
CSA5#
MAA2
MAB4#
MAA5
MAA9
MAB11#
NC
NC
CKE2
CSB0#
VCC
AE
VCC
CSA1#
SRASA#
MAA0
MAA4
MAA6
MAB8#
MAA11
MAB13
CKE1
CKE5
MAA13
VSS
AF
Name
Type
Description
CPURST#
O
GTL+
CPU Reset. The CPURST# pin is an output from the 82443BX. The 82443BX generates this signal based on the
PCIRST# input (from PIIX4E) and also the SUSTAT# pin in mobile mode. The CPURST# allows the CPUs to begin
execution in a known state.
A[31:3]#
I/O
GTL+
Address Bus: A[31:3]# connect to the CPU address bus. During CPU cycles, the A[31:3]# are inputs.
HD[63:0]#
I/O
GTL+
Host Data: These signals are connected to the CPU data bus. Note that the data signals are inverted on the CPU bus.
ADS#
I/O
GTL+
Address Strobe: The CPU bus owner asserts ADS# to indicate the first of two cycles of a request phase.
BNR#
I/O
GTL+
Block Next Request: Used to block the current request bus owner from issuing a new request. This signal is used to
dynamically control the CPU bus pipeline depth.
BPRI#
O
GTL+
Priority Agent Bus Request: The 82443BX is the only Priority Agent on the CPU bus. It asserts this signal to obtain the
ownership of the address bus. This signal has priority over symmetric bus requests and will cause the current symmet-
ric owner to stop issuing new transactions unless the HLOCK# signal was asserted.
BREQ0#
O
GTL+
Symmetric Agent Bus Request: Asserted by the 82443BX when CPURST# is asserted to configure the symmetric bus
agents. BREQ0# is negated 2 host clocks after CPURST# is negated.
DBSY#
I/O
GTL+
Data Bus Busy: Used by the data bus owner to hold the data bus for transfers requiring more than one cycle.
DEFER#
O
GTL+
Defer: The 82443BX generates a deferred response as defined by the rules of the 82443BXfs dynamic defer policy.
The 82443BX also uses the DEFER# signal to indicate a CPU retry response.
DRDY#
I/O
GTL+
Data Ready: Asserted for each cycle that data is transferred.
HIT#
I/O
GTL+
Hit: Indicates that a caching agent holds an unmodified version of the requested line.
Also driven in conjunction with HITM# by the target to extend the snoop window.