- Chapter 3: Microprocessor Types and Specifications
- Pre-PC Microprocessor History
- Processor Specifications
- SMM (Power Management)
- Superscalar Execution
- MMX Technology
- SSE (Streaming SIMD Extensions)
- 3DNow and Enhanced 3DNow
- Dynamic Execution
- Dual Independent Bus (DIB) Architecture
- Processor Manufacturing
- PGA Chip Packagingx
- Single Edge Contact (SEC) and Single Edge Processor (SEP) Packaging
- Processor Sockets and Slots
- Zero Insertion Force (ZIF) Sockets
- Processor Slots
- CPU Operating Voltages
- Heat and Cooling Problems
- Math Coprocessors (Floating-Point Units)
- Processor Bugs
- Processor Update Feature
- Processor Codenames
- Intel-Compatible Processors (AMD and Cyrix)
- P1 (086) First-Generation Processors
- P2 (286) Second-Generation Processors
- P3 (386) Third-Generation Processors
- P4 (486) Fourth-Generation Processors
- P5 (586) Fifth-Generation Processors
- Pseudo Fifth-Generation Processors
- Intel P6 (686) Sixth-Generation Processors
- Other Sixth-Generation Processors
- Itanium (P7/Merced) Seventh-Generation Processors
- Processor Upgrades
- Processor Troubleshooting Techniques
Processor Slots
After introducing the Pentium Pro with its integrated L2 cache, Intel discovered that the physical package it chose was very costly to produce. Intel was looking for a way to easily integrate cache and possibly other components into a processor package, and it came up with a cartridge or board design as the best way to do this. In order to accept its new cartridges, Intel designed two different types of slots that could be used on motherboards.
Slot 1 is a 242-pin slot that is designed to accept Pentium II, Pentium III, and most Celeron processors. Slot 2 is a more sophisticated 330-pin slot that is designed for the Pentium II and III Xeon processors, which are primarily for workstations and servers. Besides the extra pins, the biggest difference between Slot 1 and Slot 2 is the fact that Slot 2 was designed to host up to four-way or more processing in a single board. Slot 1 only allows single or dual processing functionality.
Note that Slot 2 is also called SC330, which stands for Slot Connector with 330 pins.
Slot 1 (SC242)
Slot 1, also called SC242 (Slot Connector 242 pins), is used by the SEC (Single Edge Cartridge) design used with the cartridge-type Pentium II/III and Celeron processors. Inside the cartridge is a substrate card that includes the processor and L2 cache. Unlike the Pentium Pro, the L2 cache was mounted on the circuit board and not within the same chip package as the processor. This allowed Intel to use aftermarket SRAM chips instead of making them internally and also allowed it to make processors with different amounts of cache easily. For example, the original Celeron was created by taking a Pentium II and simply leaving out the external cache chips. Figure 3.22 shows the Slot 1 connector dimensions and pin layout.
See "Single Edge Contact (SEC) and Single Edge Processor (SEP) Packaging."
Figure 3.22 Slot 1 connector dimensions and pin layout.
Table 3.13 lists the names of each of the pins in the Slot 1 connector.
Table 3.13 Signal Listing in Order by Pin Number
Pin No. |
Pin Name |
A1 |
VCC_VTT |
A2 |
GND |
A3 |
VCC_VTT |
A4 |
IERR# |
A5 |
A20M# |
A6 |
GND |
A7 |
FERR# |
A8 |
IGNNE# |
A9 |
TDI |
A10 |
GND |
A11 |
TDO |
A12 |
PWRGOOD |
A13 |
TESTHI |
A14 |
GND |
A15 |
THERMTRIP# |
A16 |
Reserved |
A17 |
LINT[0]/INTR |
A18 |
GND |
A19 |
PICD[0] |
A20 |
PREQ# |
A21 |
BP#[3] |
A22 |
GND |
A23 |
BPM#[0] |
A24 |
BINIT# |
A25 |
DEP#[0] |
A26 |
GND |
A27 |
DEP#[1] |
A28 |
DEP#[3] |
A29 |
DEP#[5] |
A30 |
GND |
A31 |
DEP#[6] |
A32 |
D#[61] |
A33 |
D#[55] |
A34 |
GND |
A35 |
D#[60] |
A36 |
D#[53] |
A37 |
D#[57] |
A38 |
GND |
A39 |
D#[46] |
A40 |
D#[49] |
A41 |
D#[51] |
A42 |
GND |
A43 |
D#[42] |
A44 |
D#[45] |
A45 |
D#[39] |
A46 |
GND |
A47 |
Reserved |
A48 |
D#[43] |
A49 |
D#[37] |
A50 |
GND |
A51 |
D#[33] |
A52 |
D#[35] |
A53 |
D#[31] |
A54 |
GND |
A55 |
D#[30] |
A56 |
D#[27] |
A57 |
D#[24] |
A58 |
GND |
A59 |
D#[23] |
A60 |
D#[21] |
A61 |
D#[16] |
A62 |
GND |
A63 |
D#[13] |
A64 |
D#[11] |
A65 |
D#[10] |
A66 |
GND |
A67 |
D#[14] |
A68 |
D#[9] |
A69 |
D#[8] |
A70 |
GND |
A71 |
D#[5] |
A72 |
D#[3] |
A73 |
D#[1] |
A74 |
GND |
A75 |
BCLK |
A76 |
BR0# |
A77 |
BERR# |
A78 |
GND |
A79 |
A#[33] |
A80 |
A#[34] |
A81 |
A#[30] |
A82 |
GND |
A83 |
A#[31] |
A84 |
A#[27] |
A85 |
A#[22] |
A86 |
GND |
A87 |
A#[23] |
A88 |
Reserved |
A89 |
A#[19] |
A90 |
GND |
A91 |
A#[18] |
A92 |
A#[16] |
A93 |
A#[13] |
A94 |
GND |
A95 |
A#[14] |
A96 |
A#[10] |
A97 |
A#[5] |
A98 |
GND |
A99 |
A#[9] |
A100 |
A#[4] |
A101 |
BNR# |
A102 |
GND |
A103 |
BPRI# |
A104 |
TRDY# |
A105 |
DEFER# |
A106 |
GND |
A107 |
REQ#[2] |
A108 |
REQ#[3] |
A109 |
HITM# |
A110 |
GND |
A111 |
DBSY# |
A112 |
RS#[1] |
A113 |
Reserved |
A114 |
GND |
A115 |
ADS# |
A116 |
Reserved |
A117 |
AP#[0] |
A118 |
GND |
A119 |
VID[2] |
A120 |
VID[1] |
A121 |
VID[4] |
B1 |
EMI |
B2 |
FLUSH# |
B3 |
SMI# |
B4 |
INIT# |
B5 |
VCC_VTT |
B6 |
STPCLK# |
B7 |
TCK |
B8 |
SLP# |
B9 |
VCC_VTT |
B10 |
TMS |
B11 |
TRST# |
B12 |
Reserved |
B13 |
VCC_CORE |
B14 |
Reserved |
B15 |
Reserved |
B16 |
LINT[1]/NMI |
B17 |
VCC_CORE |
B18 |
PICCLK |
B19 |
BP#[2] |
B20 |
Reserved |
B21 |
BSEL# |
B22 |
PICD[1] |
B23 |
PRDY# |
B24 |
BPM#[1] |
B25 |
VCC_CORE |
B26 |
DEP#[2] |
B27 |
DEP#[4] |
B28 |
DEP#[7] |
B29 |
VCC_CORE |
B30 |
D#[62] |
B31 |
D#[58] |
B32 |
D#[63] |
B33 |
VCC_CORE |
B34 |
D#[56] |
B35 |
D#[50] |
B36 |
D#[54] |
B37 |
VCC_CORE |
B38 |
D#[59] |
B39 |
D#[48] |
B40 |
D#[52] |
B41 |
EMI |
B42 |
D#[41] |
B43 |
D#[47] |
B44 |
D#[44] |
B45 |
VCC_CORE |
B46 |
D#[36] |
B47 |
D#[40] |
B48 |
D#[34] |
B49 |
VCC_CORE |
B50 |
D#[38] |
B51 |
D#[32] |
B52 |
D#[28] |
B53 |
VCC_CORE |
B54 |
D#[29] |
B55 |
D#[26] |
B56 |
D#[25] |
B57 |
VCC_CORE |
B58 |
D#[22] |
B59 |
D#[19] |
B60 |
D#[18] |
B61 |
EMI |
B62 |
D#[20] |
B63 |
D#[17] |
B64 |
D#[15] |
B65 |
VCC_CORE |
B66 |
D#[12] |
B67 |
D#[7] |
B68 |
D#[6] |
B69 |
VCC_CORE |
B70 |
D#[4] |
B71 |
D#[2] |
B72 |
D#[0] |
B73 |
VCC_CORE |
B74 |
RESET# |
B75 |
BR1# |
B76 |
FRCERR |
B77 |
VCC_CORE |
B78 |
A#[35] |
B79 |
A#[32] |
B80 |
A#[29] |
B81 |
EMI |
B82 |
A#[26] |
B83 |
A#[24] |
B84 |
A#[28] |
B85 |
VCC_CORE |
B86 |
A#[20] |
B87 |
A#[21] |
B88 |
A#[25] |
B89 |
VCC_CORE |
B90 |
A#[15] |
B91 |
A#[17] |
B92 |
A#[11] |
B93 |
VCC_CORE |
B94 |
A#[12] |
B95 |
A#[8] |
B96 |
A#[7] |
B97 |
VCC_CORE |
B98 |
A#[3] |
B99 |
A#[6] |
B100 |
EMI |
B101 |
SLOTOCC# |
B102 |
REQ#[0] |
B103 |
REQ#[1] |
B104 |
REQ#[4] |
B105 |
VCC_CORE |
B106 |
LOCK# |
B107 |
DRDY# |
B108 |
RS#[0] |
B109 |
VCC5 |
B110 |
HIT# |
B111 |
RS#[2] |
B112 |
Reserved |
B113 |
VCC_L2 |
B114 |
RP# |
B115 |
RSP# |
B116 |
AP#[1] |
B117 |
VCC_L2 |
B118 |
AERR# |
B119 |
VID[3] |
B120 |
VID[0] |
B121 |
VCC_L2 |
Slot 2 (SC330)
Slot 2, otherwise called SC330 (Slot Connector 330 pins) is used on high-end motherboards that support the Pentium II and III Xeon processors. Figure 3.23 shows the Slot 2 connector.
Figure 3.23 Slot 2 (SC330) connector dimensions and pin layout.
The Xeon processors are designed in a cartridge similar to, but larger than, that used for the standard Pentium II/III. Figure 3.24 shows the Xeon cartridge.
Motherboards featuring Slot 2 are primarily found in higher-end systems such as workstations or servers, which use the Xeon processors. These are Intel's high-end chips, which differ from the standard Pentium II/III mainly by virtue of having full-core speed L2 cache, and in some versions more of it.
Figure 3.24 Pentium II/III Xeon cartridge.