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A transmitting device and a receiving device are coupled via a high-speed serial interface within a computer system. The transmitting device transmits a packet that includes an extended type/extended length field that extends either a type field or a length field depending on the value of the type f

A transmitting device and a receiving device are coupled via a high-speed serial interface within a computer system. The transmitting device transmits a packet that includes an extended type/extended length field that extends either a type field or a length field depending on the value of the type field. The extended type/extended length field extends the length field when the type field indicates a memory read request transaction.

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1. An apparatus of a data processing system, comprising:a communication stack to communicate with another apparatus within the data processing system over a point-to-point interconnect, the communication stack having a transaction layer, a data link layer, and a physical layer, the transaction layer

1. An apparatus of a data processing system, comprising:a communication stack to communicate with another apparatus within the data processing system over a point-to-point interconnect, the communication stack having a transaction layer, a data link layer, and a physical layer, the transaction layer to transmit a plurality of packets to the another apparatus in serial over the point-to-point interconnect, each packet having a packet header, the packet header including a first field to extend one of a second field and a third field depending on the contents of the second field. 2. The apparatus of claim 1, wherein the second field is a type field.3. The apparatus of claim 2, wherein the third field is a length field.4. The apparatus of claim 3, wherein the first field is used to extend the length field when the type field indicates a memory read request transaction.5. The apparatus of claim 4, wherein the first field is located between and immediately adjacent to the type field and the length field in the packet header.6. The apparatus of claim 5, wherein the type field is located in the first byte of the packet header to be output by the data path output unit.7. The system of claim 2, wherein the third field is a length field.8. The system of claim 7, wherein the first field is used to extend the length field when the type field indicates a memory read request transaction.9. The system of claim 8, wherein the first field is located between and immediately adjacent to the type field and the length field in the packet header.10. The system of claim 9, wherein the type field is located in the first byte of the packet header to be output by the data path output unit.11. The system of claim 1, wherein the second field is a type field.12. An apparatus of a data processing system, comprising:a communication stack to communicate with another apparatus within the data processing system over a point-to-point interconnect, the communication stack having a transaction layer, a data link layer, and a physical layer, the transaction layer to receive a plurality of packets from the another apparatus in serial over the point-to-point interconnect, each packet having a packet header, the packet header including a first field to extend one of a second field or a third field depending on the contents of the second field. 13. The apparatus of claim 12, wherein the second field is a type field.14. The apparatus of claim 13, wherein the third field is a length field.15. The apparatus of claim 14, wherein the first field is used to extend the length field when the type field indicates a memory read request transaction.16. The apparatus of claim 15, wherein the first field is located between and immediately adjacent to the type field and the length field in the packet header.17. The apparatus of claim 16, wherein the type field is located in the first byte of the packet header to be output by the data path output unit.18. A system, comprising:a point-to-point interconnect; a transmitting device having a first communication stack including a transaction layer, a data link layer, and a physical layer, the transaction layer to transmit a plurality of packets serially onto the point-to-point interconnect, each packet having a packet header, the packet header including a first field to extend one of a second field or a third field depending on the contents of the second field; and a receiving device communicatively couple to the transmitting device over the point-to-point interconnect, the receiving device having a second communication stack including a transaction layer, a data link layer, and a physical layer, the transaction layer to receive the plurality of packets serially from the transmitting device over the point-to-point interconnect.