下面的例子是针对TI的ZStack-CC2530-2.5.0中的SerialApp例程(非官方例程)进行编译剖析，通过查看编译输出的MAP文件来了解XDATA的大致情况。
我们知道CC2530是8K的内存，这部分就是XDATA的大小，官方例程编译完成已经用了7K左右的内存了，剩余给我们使用的内存并不多。一旦我们想要扩大部分参数的时候，这点内存就显得捉襟见肘了。
XDATA是用于静态变量，包括全局变量和本地变量，如全局变量中的路由表，绑定表，以及协议栈使用的内存堆等，以及本地变量如ZDP_BUF等。下面罗列出几个占用XDATA较多的静态变量，开发者如果想要节省出部分XDATA用于自己的程序，需要评估自己的应用情况，酌情减少一些静态变量，不要影响到自己原来功能的稳定性。
1.theHeap 2600 bytes.
Relative segment, address: XDATA 000011D3 - 00001BFA (0xa28 bytes), align: 0
Segment part 7. Intra module refs: osal_mem_alloc
osal_mem_free
osal_mem_init
LOCAL ADDRESS
===== =======
theHeap 000011D3
2.ZDP_Buf 80 bytes.
Relative segment, address: XDATA 000005DB - 0000062A (0x50 bytes), align: 0
Segment part 8. Intra module refs: ?Subroutine52
Segment part 10
ZDP_MgmtNwkUpdateNotify
ZDP_MgmtRtgRsp
ENTRY ADDRESS REF BY
===== ======= ======
ZDP_Buf 000005DB
3. app_AtProcess::buf 这是函数中的静态缓冲 180 bytes.
Relative segment, address: XDATA 00000671 - 00000724 (0xb4 bytes), align: 0
Segment part 160. Intra module refs: ?Subroutine34
app_AtProcess
LOCAL ADDRESS
===== =======
app_AtProcess::buf 00000671
4.SerialApp_TxBuf 81 bytes.
Relative segment, address: XDATA 0000072A - 0000077A (0x51 bytes), align: 0
Segment part 23. Intra module refs: app_AuxDataSend
LOCAL ADDRESS
===== =======
SerialApp_TxBuf 0000072A
5.SerialApp_ChildBuf 44 bytes.
Relative segment, address: XDATA 000007CB - 000007F6 (0x2c bytes), align: 0
Segment part 30. Intra module refs: ?Subroutine25
app_MgrChildQuery
LOCAL ADDRESS
===== =======
SerialApp_ChildBuf 000007CB
6. dmaCh1234 32 bytes.
Relative segment, address: XDATA 00000807 - 00000826 (0x20 bytes), align: 0
Segment part 16. Intra module refs: HalDmaInit
ENTRY ADDRESS REF BY
===== ======= ======
dmaCh1234 00000807 AesDmaSetup (hal_aes)
HalUARTInitDMA (hal_uart)
HalUARTPollDMA (hal_uart)
Segment part 17 (hal_aes)
aesDmaInit (hal_aes)
7. HalLedStatusControl 37 bytes.
Relative segment, address: XDATA 00000831 - 00000855 (0x25 bytes), align: 0
Segment part 10. Intra module refs: ?Subroutine0
HalLedBlink
HalLedSet
HalLedUpdate
LOCAL ADDRESS
===== =======
HalLedStatusControl 00000831
8.dmaCfg 这边用于串口缓冲等 529 bytes.
Relative segment, address: XDATA 00000867 - 00000A77 (0x211 bytes), align: 0
Segment part 26. Intra module refs: ?Subroutine10
?Subroutine14
?Subroutine16
?Subroutine18
?Subroutine4
?Subroutine7
HalUARTInitDMA
HalUARTIoctl
HalUARTIsrDMA
HalUARTOpenDMA
HalUARTPollDMA
HalUARTReadDMA
HalUARTRxAvailDMA
HalUARTWriteDMA
Segment part 59
LOCAL ADDRESS
===== =======
dmaCfg 00000867
9.macPib 60 bytes.
Relative segment, address: XDATA 00000A97 - 00000AD2 (0x3c bytes), align: 0
Segment part 9. Intra module refs: MAC_MlmeGetReq
MAC_MlmeSetReq
macPibReset
ENTRY ADDRESS REF BY
===== ======= ======
macPib 00000A97 MAC_MlmeResetReq (mac_beacon很多，不列了
10. AssociatedDevList 414 bytes.
Relative segment, address: XDATA 00000AF7 - 00000C94 (0x19e bytes), align: 0
Segment part 23.
ENTRY ADDRESS REF BY
===== ======= ======
AssociatedDevList 00000AF7 AssocFindEmpty (AddrMgr)
AssocGetNextNode (AddrMgr)
AssocGetWithAddress (AddrMgr)
AssocInit (AddrMgr)
AssocMatchDeviceStatus (AddrMgr)
AssocWriteNV (AddrMgr)
RTG_BcastAdd (AddrMgr)
Segment part 165 (AddrMgr)
Segment part 199 (AddrMgr)
Segment part 201 (AddrMgr)
Segment part 208 (AddrMgr)
Segment part 209 (AddrMgr)
Segment part 620 (nwk)
Segment part 625 (AddrMgr)
Segment part 738 (nwk)
Segment part 743 (nwk)
nwkNeighborFindRandom (nwk)
11.neighborTable 368 bytes.
Relative segment, address: XDATA 00000C95 - 00000E04 (0x170 bytes), align: 0
Segment part 30.
ENTRY ADDRESS REF BY
===== ======= ======
neighborTable 00000C95 AssocCheckDupNeighbors (AddrMgr)
RTG_AddRtgEntry (AddrMgr)
RTG_BcastAdd (AddrMgr)
Segment part 618 (nwk)
Segment part 633 (AddrMgr)
Segment part 695 (nwk)
Segment part 714 (nwk)
Segment part 719 (nwk)
Segment part 740 (nwk)
Segment part 748 (nwk)
Segment part 761 (nwk)
Segment part 762 (nwk)
Segment part 765 (nwk)
fun_printNBT (app_at)
nwkNeighborChangePANID (nwk)
nwkNeighborFindEmptySlot (nwk)
nwkNeighborFindRandom (nwk)
nwkNeighborUpdateNwkAddr (nwk)
12.rtgTable 280 bytes.
Relative segment, address: XDATA 00000E05 - 00000F1C (0x118 bytes), align: 0
Segment part 35.
ENTRY ADDRESS REF BY
===== ======= ======
rtgTable 00000E05 ?Subroutine33 (app_at)
NLME_GetRequest (AddrMgr)
RTG_AddRtgEntry (AddrMgr)
RTG_GetRtgEntry (AddrMgr)
RTG_TimerEvent (AddrMgr)
RTG_initRtgTable (AddrMgr)
RTG_nextHopIsBad (AddrMgr)
13.rtgSrcTable 72 bytes.
Relative segment, address: XDATA 00000F1D - 00000F64 (0x48 bytes), align: 0
Segment part 36.
ENTRY ADDRESS REF BY
===== ======= ======
rtgSrcTable 00000F1D RTG_AddSrcRtgEntry (AddrMgr)
RTG_GetRtgSrcIndex (AddrMgr)
Segment part 472 (AddrMgr)
Segment part 533 (AddrMgr)
Segment part 548 (AddrMgr)
14.rtgSrcRelayList 源路由转发路径 24 bytes.
Relative segment, address: XDATA 00000F65 - 00000F7C (0x18 bytes), align: 0
Segment part 37.
ENTRY ADDRESS REF BY
===== ======= ======
rtgSrcRelayList 00000F65 NLDE_ParseMsg (nwk)
RTG_ProcessRrec (AddrMgr)
15.rtDiscTable 64 bytes.
Relative segment, address: XDATA 00000F7D - 00000FBC (0x40 bytes), align: 0
Segment part 38.
ENTRY ADDRESS REF BY
===== ======= ======
rtDiscTable 00000F7D RTG_CheckRtDiscEntry (AddrMgr)
RTG_GetPrevHop (AddrMgr)
RTG_GetRtDiscEntry (AddrMgr)
RTG_TimerEvent (AddrMgr)
RTG_UpdateRtDiscEntry (AddrMgr)
Segment part 470 (AddrMgr)
16.bcastTable 168 bytes.
Relative segment, address: XDATA 00000FBD - 00001064 (0xa8 bytes), align: 0
Segment part 39.
ENTRY ADDRESS REF BY
===== ======= ======
bcastTable 00000FBD RTG_BcastAdd (AddrMgr)
RTG_BcastChk (AddrMgr)
RTG_BcastTimerHandler (AddrMgr)
RTG_Init (AddrMgr)
17.bcastHoldHandle 21 bytes.
Relative segment, address: XDATA 00001065 - 00001079 (0x15 bytes), align: 0
Segment part 40.
ENTRY ADDRESS REF BY
===== ======= ======
bcastHoldHandle 00001065 Segment part 600 (AddrMgr)
Segment part 636 (AddrMgr)
18.bcastHoldAckMask 84 bytes.
Relative segment, address: XDATA 0000107A - 000010CD (0x54 bytes), align: 0
Segment part 41.
ENTRY ADDRESS REF BY
===== ======= ======
bcastHoldAckMask 0000107A RTG_DataReq (AddrMgr)
Segment part 640 (AddrMgr)
19.BindingTable 56 bytes.
Relative segment, address: XDATA 000010CE - 00001105 (0x38 bytes), align: 0
Segment part 54.
ENTRY ADDRESS REF BY
===== ======= ======
BindingTable 000010CE ?Subroutine15 (BindingTable)
?Subroutine16 (BindingTable)
?Subroutine22 (BindingTable)
?Subroutine23 (BindingTable)
?Subroutine24 (BindingTable)
?Subroutine27 (BindingTable)
GetBindingTableEntry(BindingTable)
InitBindingTable (BindingTable)
Segment part 54 (BindingTable)
Segment part 64 (BindingTable)
bindAddEntry (BindingTable)
bindFind (BindingTable)
bindFindExisting (BindingTable)
bindNumOfEntries (BindingTable)